Готові списки джерел за темами / Centrifugal blower

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Добірка наукової літератури з теми "Centrifugal blower"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 31 травня 2022

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Статті в журналах з теми "Centrifugal blower"

Ammed, Sohail. "Low noise centrifugal blower." Journal of the Acoustical Society of America 100, no. 1 (1996): 27. http://dx.doi.org/10.1121/1.415904.

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Aslamova, V. S., O. A. Troshkin, and A. N. Sherstyuk. "Centrifugal blower-dust collector." Chemical and Petroleum Engineering 23, no. 4 (April 1987): 187–89. http://dx.doi.org/10.1007/bf01149343.

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Peng, Li Xia. "On the Design Method of Noise Reduction of Centrifugal Fan." Advanced Materials Research 487 (March 2012): 520–24. http://dx.doi.org/10.4028/www.scientific.net/amr.487.520.

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Анотація:

The application of centrifugal fan is wide, but the huge noise can pollute the environment. This paper will discuss the mechanism of centrifugal blower noise generation, and put forward noise reduction method in designing centrifugal blower creatively, thus can solve the problems effectively.

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Abdel-Hamid, A. N. "Dynamic Response of a Centrifugal Blower to Periodic Flow Fluctuations." Journal of Engineering for Gas Turbines and Power 108, no. 1 (January 1, 1986): 77–82. http://dx.doi.org/10.1115/1.3239888.

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Experimental investigation of the dynamic response of a centrifugal blower to periodic flow rate modulations was carried out at different blower operating conditions. For modulation frequencies in the range of 0.0085–0.085 of the shaft rotation frequency, the fluctuating pressures at inlet, discharge, and across a flow orifice were simultaneously measured and analyzed in the time and frequency domains. Measurements of the amplitude and phase of the transfer function between the blower static pressure rise and the discharge flow rate fluctuations indicated that the quasi-steady approximation should be limited to frequencies lower than 0.02 of the shaft rotation frequency. For the same average flow rate, the static pressure rise progressively lagged the discharge flow rate fluctuations as the frequency was increased. The trend was similar to that of the inertia effects of a fluctuating flow in a pipe. For the same frequency these inertia effects increased as the average flow rate through the blower was decreased. Applications of the results to on-line measurements of the slope of the characteristic curve and improved dynamic modeling of centrifugal compressors and blowers are discussed.

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Sun, Pan, Xiaoliang Wang, and Weicheng Xie. "Centrifugal Blower of Stratospheric Airship." IEEE Access 6 (2018): 10520–29. http://dx.doi.org/10.1109/access.2018.2809707.

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Prezelj, J., and M. Čudina. "Quantification of aerodynamically induced noise and vibration-induced noise in a suction unit." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 3 (February 7, 2011): 617–24. http://dx.doi.org/10.1243/09544062jmes2187.

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Noise, generated by a centrifugal blower, can be divided according to its origin, into aerodynamically induced noise and vibration-induced noise. The contribution of the individual noise source to the total emitted noise is hard to determine, but it is crucial for the design of noise reduction measures. In order to reduce the noise of the centrifugal blower in a broad range of operating conditions, an identification of noise sources needs to be performed. An analysis of the most important noise origin in a centrifugal blower presented in this article was performed by measurements of the transfer function between noise and vibration, under different types of excitation. From the analyses one can conclude that the dominant noise source of a centrifugal blower can be attributed to the aerodynamically generated noise which exceeds the vibration-induced noise for more than 10 dB in a broad frequency range.

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Chen, Jian Dong, and Bei Bei Sun. "Optimization of Low-Noise and Large Air Volume Blower Based on Load Characteristic." Key Engineering Materials 656-657 (July 2015): 700–705. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.700.

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The blower is a kind of garden machinery, which blows strong wind to clean up leaves by a centrifugal fan, but it causes a loud aerodynamic noise. To compromise the contradiction between large air flow rate and low fan noise, some optimizations are proposed to reduce fan noise without lowering its air volume. In this paper, a CFD numerical model to compute airflow field of blower is established, where the centrifugal fan is simulated by the MRF model, and theturbulent model is selected. By smoothing the transition section, improving the volute tongue and optimizing the shape and optimizing number of fan blade, the blower work performance is increased obviously. In order to find out the actual working point, both the fan and motor load characteristic curves are drawn out. The simulation results show that, at the actual working point, the speed of the centrifugal fan is reduced, while the flow rate of blower is raised up. The optimizations are applied to the blower, and the experiment of the improved blower shows the flow rate is increased 5%, and the noise is reduced 2dB.

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Kim, Jae-Won. "Centrifugal Blower with High Inlet Resistance." Journal of Fluid Machinery 6, no. 2 (June 1, 2003): 15–22. http://dx.doi.org/10.5293/kfma.2003.6.2.015.

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CHENGQIAN, DONG, and Hiroshi SUGIYAMA. "Noise sources for turbofan centrifugal blower." Proceedings of Conference of Kansai Branch 2020.95 (2020): P_049. http://dx.doi.org/10.1299/jsmekansai.2020.95.p_049.

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Gherman, B., M. Gall, V. A. Popa, and V.-A. Sterie. "IGV position optimization for centrifugal blower." IOP Conference Series: Materials Science and Engineering 400 (September 18, 2018): 042025. http://dx.doi.org/10.1088/1757-899x/400/4/042025.

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Більше джерел

Дисертації з теми "Centrifugal blower"

Liskiewicz, Grzegorz. "Numerical model of the flow phenomena preceding surge in the centrifugal blower and assessment of its applicability in designing anti-surge devices." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24352.

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The dissertation is devoted to analysis of unstable phenomena in the centrifugal blower. These phenomena are known to be a source of serious threat to safety of the machine and the piping system connected to it. The complexity of centrifugal impellers causes that instabilities therein can have various forms and locations and have been subject of interest for over 60 years. The dissertation consists of two main parts: one of them being a result of the experimental investigations, the other one describing an outcome of the numerical simulations. In the experimental part, three methods of data analysis were applied: static, dynamic and a novel approach referred to as the quasi-dynamic one. The blower was examined in two configurations of the outlet pipe corresponding to different outlet plenum volumes. The results were presented in a form of a performance curve, amplitude plots, scalograms, phase trajectories and spectral maps. The machine was found to operate in four different regimes , namely: the stable regime, the inlet recirculation, the transient phase and the deep surge. The inlet recirculation was identifed as the earliest instability present in the inlet zone. It was characterized by strong pressure jumps and a spectral structure of broadband noise. In the transient phase, the pressure oscillation amplitude grew by one order of magnitude and appeared in all points analyzed. In the deep surge, strong pressure oscillations appeared, with one frequency component close to the Helmholtz frequency. A new factor that can be used for real-time monitoring and early detection of unstable flow phenomena was developed as a result of signal phase trajectory analysis. The second part presents results of the transient numerical simulations conducted with FLUENT and then compared to the experimental data. The full impeller geometry was simulated together with the diffuser, the volute and large volumes of the inlet and outlet pipes. Computations were run at different combinations of the boundary conditions corresponding to different operational points. Simulations with a reduced plenum volume were also conducted analogously to the experimental study. The machine was found to operate in four working regimes: stable regime, pre-surge (impeller instability), presurge (inlet recirculation) and the deep surge. An overview on the machine performance was provided together with a detailed description of particular flow structures. The results were compared to the experimental data by means of, a performance curve, phase trajectories and frequency spectra and were found to be in reasonable agreement. The numerical study introduced a possibility of a detailed analysis of unstable flow structures such as the inlet recirculation, the impeller instability, a the deep surge cycle. The study confirmed that computational methods introduce an opportunity to understand the unstable flow structures in detail and provide a missing link between real flow phenomena and mathematical surge and stall models, which is essential for effective anti-surge protection.

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Фесенко, Ксения Владимировна. "Метод расчетно-теоретического исследования структуры течения и характеристик ступеней центробежных нагнетателей". Thesis, Национальный аэрокосмический университет им. Н. Е. Жуковского "Харьковский авиационный институт", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/17150.

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Диссертация на соискание ученой степени кандидата технических наук по специальности 05.05.16 – турбомашины и турбоустановки. – Национальный технический университет "Харьковский политехнический институт", Харьков, 2015 г. В диссертации разработан метод расчетно-теоретического исследования структуры течения и характеристик ступеней центробежных нагнетателей с радиальными лопатками рабочих колес, который позволяет определять в широком диапазоне режимов работы суммарные характеристики и структуру осредненного в окружном направлении сжимаемого дозвукового течения в проточной части, включая межлопаточные каналы. Для учета вязких эффектов использованы обобщенные полуэмпирические зависимости, используемые при анализе течения в центробежных нагнетателях. Данный метод расчета позволяет учитывать геометрические особенности радиальных рабочих колес с лопатками, образованными цилиндрическими и коническими поверхностями, безлопаточных и лопаточных диффузоров, обратных направляющих аппаратов. На основе предложенного метода разработан программный комплекс AxCB, который позволяет проводить численный анализ двумерного дозвукового течения в ступенях центробежных нагнетателей, определять поля газотермодинамичних параметров потока газа и суммарные характеристики ступеней, а также их отдельных элементов. Верификация разработанного метода расчета показала удовлетворительную точность согласования результатов численных исследований течений в криволинейных каналах, рабочих колесах, отдельных элементах и ступенях в целом с данными экспериментальных исследований, а также с аналитическим решением. С помощью предложенного метода и ПК AxCB проведено исследование влияния различных геометрических параметров проточной части и лопаточных венцов на структуру течения и суммарные характеристики ступеней ЦБН, а именно формы средней линии и величины геометрического угла выхода лопатки РК, формы меридиональных обводов проточной части и величины геометрического угла лопатки на входе в ЛД, а также различных вариантов исполнения диффузора ступени. На основании выполненного детального анализа предложено усовершенствование геометрических параметров трех ступеней ЦБН с целью повышения их основных параметров. Ступень "А" усовершенствована путем изменения формы средней линии, а также величины конструктивного угла лопатки на выходе из РК, что привело к увеличению коэффициента политропического напора и расширении рабочей зоны характеристики нагнетателя. Модернизация ступени "Б" заключалась в коррекции формы меридиональных обводов проточной части и величины конструктивного угла лопатки на входе в ЛД, что привело к улучшению согласования работы РК и ЛД. После проведения расчетов ряда вариантов проточной части ступени "В", отличающихся используемым диффузором и шириной проточной части, были даны рекомендации по совершенствованию суммарных характеристик ступени, что при-вело к увеличению коэффициента политропического напора и КПД.
Thesis for scientific degree of the Candidate of Sciences (Engineering) on the special-ty 05.05.16 – Turbomachinery and Turboplants. – National Technical University "Kharkiv Politechnical Institute", Kharkov, 2015. The calculation and theoretical studies method of flow structure and characteristics of centrifugal blowers stages with impellers radial vanes was created. It allows determining summary characteristics and 2D flow structure of flow path including blade-to-blade channels in wide range of working regimes. To account for viscous effects generalized semiempirical dependences for centrifugal blowers were used. The proposed method allows taking into account the geometric features of radial impeller with blades that formed by cylindrical and conical surfaces, vaneless and vaned diffusers, reverse guide vanes and gas-path curvilinear contours. The software package AxCB was developed, which allows carrying out the verification of the calculation method. It showed satisfactory accuracy of flow numerical investigation results in the stages with experimental and analytical data. With the proposed method and software package AxCB studies were undertook which dealt with influence of different geometric parameters of flow path and blade rows on the flow structure and stages summary characteristics. On the basis of a detailed analysis modernization of three centrifugal blower stages was proposed to improve their basic parameters or expand the characteristic working area.

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Фесенко, Ксенія Володимирівна. "Метод розрахунково-теоретичного дослідження структури течії та характеристик ступенів відцентрових нагнітачів". Thesis, НТУ "ХПІ", 2015. http://repository.kpi.kharkov.ua/handle/KhPI-Press/17148.

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Анотація:

Дисертація на здобуття наукового ступеня кандидата технічних наук за фахом 05.05.16 – турбомашини та турбоустановки. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2015 р. В дисертації розроблено метод розрахунково-теоретичного дослідження структури течії та характеристик ступенів відцентрових нагнітачів з радіальними лопатками робочих коліс, який дозволяє визначати в широкому діапазоні режимів роботи сумарні характеристики та структуру осередненої у коловому напрямку стисливої дозвукової течії в проточній частині, включаючи міжлопаткові канали. Для врахування в'язких ефектів використані узагальнені напівемпіричні залежності, що використовуються для розрахунку відцентрових нагнітачів. Запропонований метод дозволяє врахувати геометричні особливості радіальних робочих коліс з лопатками, що образовані циліндричними або конічними поверхнями, лопаткових і безлопаткових дифузорів, зворотних направляючих апаратів та криволінійних обводів проточних частин, а також оцінювати узгодженість їх сумісної роботи. За допомогою розробленого програмного комплексу AxCB проведено верифікацію методу розрахунку, яка показала задовільну точність зіставлення результатів числових досліджень течій в ступенях ВЦН з даними експериментальних досліджень та з аналітичним рішенням. Проведено дослідження впливу геометричних параметрів проточної частини і лопаткових вінців на структуру течії і сумарні характеристики ступенів ВЦН. На підставі виконаного детального аналізу запропоновано удосконалення геометричних параметрів трьох ступенів ВЦН з метою підвищення їх напору, ККД або розширення робочої зони характеристики.
Thesis for scientific degree of the Candidate of Sciences (Engineering) on the special-ty 05.05.16 – Turbomachinery and Turboplants. – National Technical University "Kharkiv Politechnical Institute", Kharkov, 2015. The calculation and theoretical studies method of flow structure and characteristics of centrifugal blowers stages with impellers radial vanes was created. It allows determining summary characteristics and 2D flow structure of flow path including blade-to-blade channels in wide range of working regimes. To account for viscous effects generalized semiempirical dependences for centrifugal blowers were used. The proposed method allows taking into account the geometric features of radial impeller with blades that formed by cylindrical and conical surfaces, vaneless and vaned diffusers, reverse guide vanes and gas-path curvilinear contours. The software package AxCB was developed, which allows carrying out the verification of the calculation method. It showed satisfactory accuracy of flow numerical investigation results in the stages with experimental and analytical data. With the proposed method and software package AxCB studies were undertook which dealt with influence of different geometric parameters of flow path and blade rows on the flow structure and stages summary characteristics. On the basis of a detailed analysis modernization of three centrifugal blower stages was proposed to improve their basic parameters or expand the characteristic working area.

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Taylor, Alan. "The effects of centrifugal blowers, control valves, attenuating devices and reservoir resonance on organ pipe flutter." Thesis, University of Salford, 2019. http://usir.salford.ac.uk/49776/.

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Анотація:

The aim of this research is to investigate the noticeable organ pipe flutter that may, under certain conditions, exist on a sounding organ pipe. The effectiveness of a pipe organ wind system is notoriously difficult to predict. For many years pipe organ builders have been aware of organ pipe flutter and several have tried to address the problem with little success. For pureness of tone it is important that the wind system is perfectly steady and without any imperfections that may cause organ pipe flutter. A survey of 83 UK pipe organs, was conducted by 8 organ tuners, confirms that 57% of the pipe organs surveyed had organ pipe flutter. Organ pipe flutter is particularly noticeable when tuning pipework or playing single notes. During this condition there is "no flow" in the duct connecting the blower to the reservoir. Using a specially constructed test apparatus, built from pipe organ components, this research examines the conditions necessary to produce organ pipe flutter, and how organ pipe flutter may be eliminated. Employing a microphone to measure a sounding test organ pipe and an accelerometer to measure the vibration of a reservoir top, various pipe organ wind system elements are examined and correlated with the excitation and attenuation of the reservoir top vibration and organ pipe flutter. The reservoir acts as a mass spring system. For weighted wind systems the mechanical mass, which may exceed 100kgs, is the dominant factor. For sprung reservoir wind systems, the mass is approximately 25% of that for a weighted system and is less dominant. Results indicate that under certain conditions, the blower excites the reservoir at its natural resonant frequency with sufficient amplitude to cause unwanted amplitude modulation on a sounding organ pipe. Results are systematically presented for weighted and sprung reservoir wind systems, organ blowers and the effects of blade frequencies, reservoir control valves, and attenuating devices inserted between the blower and the reservoir, to determine their effect on reservoir top vibration and the development of organ pipe flutter. With this knowledge, the pipe organ builder will be able to build pipe organs with improved wind systems and flutter free pipework.

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Li, Ying-Hung, and 李盈宏. "High Speed Centrifugal Blower Design dor Fuel Cells." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/35912542206259790965.

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Анотація:

碩士
國立臺灣大學
機械工程學研究所
95
Blowers play key roles in the operation of fuel cells system. Fuel cells rely on blowers to supply air to the cathode in the stack and the blower efficiency is a critical factor in maximizing the overall efficiency of a system. For these reason, how to find out the blower which can provide high pressure, high efficiency, low power consumption and minimum volume is vitally important in design of fuel cells system. In this study, we create the effective design method of high speed blower for fuel cells system. We use the empirical formulas to make up prototype. Then we can observe the inner flow change in blower with CFD software and put forward some strategies to improve the problem found in inner flow region. According to analysis, there are some strategies to promote blower efficiency at the design point flow rate（0.5cmm）. To increase length of blades and reduce the volume of casing will promote the air be better guided, and ease the pressure change of air. To increase the number of blades will reduce the reverse flow near the outlet of impeller. They all will results in the rise of static pressure and performance. Finally, to decrease the height of impeller and casing will reduce electric power costed and result in the substantial rise of performance. By using these strategies, we design the grate shape of 5kW fuel cells blower which can provide 12,486Pa in static pressure, 64.2% in efficiency, and only requires about 219W at the design point flow rate. It is nearly as good as the performance of AMETEK fuel cells blower products. The design method created in this study is proved to be useful to design the high performance, high speed blower.

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Chang, C. A., and 張智安. "Design and Testing for a Centrifugal Micro Cooling Blower." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/48146108062944790041.

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Анотація:

碩士
逢甲大學
機械工程學系
89
In electronic equipment and circuits devices, power dissipation is generated and a particular cooling system is required to transfer the heat out to the atmosphere and to provide the appropriated operation temperature of circuit devices. Air is usually taken directly from the surrounding atmosphere and returned to it with a revised thermal content. Materials or objects that are cooled or warmed are almost always immersed in air. Even if another medium is used to cool a heat source, the ultimate heat sink is still the atmosphere, and, even in that case, the secondary heat transfer path to the atmosphere is usually a moving air stream. Microcooling blower (axial inflow and radial outflow configuration) can respond to the growing need for smaller profile cooling devices to handle the growing heat dissipation requirements of notebooks and handy electronic devices with high-performance microprocessors. With the advent of Intel's next series of high-performance micro processors, the high air flow rate(high fan pressure rise) micro cooling fan is required for the ultra-thin cooling system installed in the above electronic devices. In order to adapt the compact thin-plate radiator for appropriated heat transfer, the back-plate of the microcooling blower is normally used as radiator. Further , the microcooling blower requires incorporate a smaller dimension with moderated high air flow rate. The above considerations have forced the traditional radial-type blower becoming less attractive than the axial-flow fan used as blower in the cooling blower market. The force of axial-flow blow turn flow exit from axial to radial direction can increase the total pressure loss with the penalty of decreasing the air flow rate. The turning of flow associated with the pressure loss can benefit the heat transfer rate while the back-plate of micro cooling blower is used as radiator. The improvement of air flow rate in such a high pressure loss flow condition can significantly increase the capability of heat removal in electronic device. The traditional free vortex aerodynamic design is applied to present fan blade. This design can sustain a wide range of operation without breaking down by the flow separation and surge. The previous study indicates that the free vortex fan is limited by its pressure rise. This limitation can rapidly decrease the air flow rate once a high pressure loss flow condition is met. The inclusion of guide vane device can improve the pressure rise and maintain the appropriated air flow rate in high pressure loss flow condition. Due to the sizing consideration, the guide vane device is not practical to use in the microcooling blower. The objective of the proposed project is to develop a forced vortex blower with the resistance of high pressure loss in a moderate drop of air flow rate. The preliminary study has indicated the forced vortex fan can maintain a higher air flow rate comparing to the free vortex fan at a high pressure loss condition. The proposed research work will develop a forced vortex aerodynamic design system for microcooling blower, and use this design system to design two different types of microcooling blower. The rapid prototyping will be used to manufacture these blower to save turn around time. A test wind tunnel will be designed and built to test the blowers.

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Liaw, Chia-Kuang, and 廖家坤. "Turbulent flow in volute and noise in the centrifugal blower." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/27235501932304619158.

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Syu, Jhih-Shen, and 徐志伸. "Design and Analysis of Performance Improvement for Single-Suction Centrifugal Blower." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/5956sq.

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碩士
國立虎尾科技大學
機械與機電工程研究所
99
In this thesis single-suction centrifugal blower are designed to enhance the performance. This thesis uses the range hood as example. The range hood of the common structure with dual-motor dual-fan is improved as a single structure of a single fan. It can reduce weight and enhance the air quantity. This thesis design a centrifugal volute makes flow more smoothly, by a single fan to exhaust to the dual inlet, and to allow a single fan can double-fan''s performance. This thesis use different types of fans, centrifugal volute, wind speed to analyze and compare, in order to achieve better design. This thesis creates 3D models with Solid Works, and use ANSYS to simulate the flow field analysis. The simulation results compare with the investigation date of wind tunnel for the range hood. Single-suction centrifugal blower can be applied to the wide range, the advantages of high air quantity, can be applied to a variety of machines, precision equipment cooling. The centrifugal blower has exhaust efficiency better then axial fan in the cooling effect. This thesis increase efficiency and simplify the structure for sigle-suction centrifugal blower. Keywords: Centrifugal blower, Fan and flow-field Analysis, Design of centrifugal volute, ANSYS.

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Книги з теми "Centrifugal blower"

The 2006-2011 World Outlook for Centrifugal Fans and Blowers Excluding Centrifugal Blower-Filter Units, Class I-IV Centrifugal Fans, and All Parts. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Centrifugal Fans and Blowers Excluding Centrifugal Blower-Filter Units, Class I-IV Centrifugal Fans, and All Parts. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Centrifugal Blower-Filter Units. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Centrifugal Blower-Filter Units. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Centrifugal Blower-Filter Units and Class I-IV Centrifugal Fans Excluding Parts. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Steam and Hot Water Heating Element, Centrifugal Fan-Type Blower, and Propeller Fan-Type Unit Heaters Excluding Electric. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Steam and Hot Water Heating Element, Centrifugal Fan-Type Blower, and Propeller Fan-Type Unit Heaters Excluding Electric. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 Outlook for Steam and Hot Water Heating Element, Centrifugal Fan-Type Blower, and Propeller Fan-Type Unit Heaters Excluding Electric in Japan. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Steam and Hot Water Heating Element, Centrifugal Fan-Type Blower, and Propeller Fan-Type Unit Heaters Excluding Electric in India. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Steam and Hot Water Heating Element, Centrifugal Fan-Type Blower, and Propeller Fan-Type Unit Heaters Excluding Electric in Greater China. ICON Group International, Inc., 2006.

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Частини книг з теми "Centrifugal blower"

"Failure Analysis of a Large Centrifugal Blower." In ASM Failure Analysis Case Histories: Power Generating Equipment. ASM International, 2019. http://dx.doi.org/10.31399/asm.fach.power.c9001136.

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Meng, Fannian, Ziqi Zhang, Liangwen Wang, and Yiyang Liu. "Volute Optimization Based on NSGA-II Algorithm." In Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220230.

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Optimizing the volute performance can effetely improve the efficiency of a centrifugal fan by changing the volute geometric parameter, so the Kriging model is used to optimize the volute geometric parameter. Firstly, Volute radius Rd, the radius of tongue r and outlet angle of the volute θ are selected as the optimization parameters of the volute, and Latin hypercube sampling is used to configure the initial sample points, the corresponding three-dimensional aerodynamic model under each sample point configuration is constructed. CFD software is used to simulate the efficiency value and total pressure of the centrifugal blower under each initial sample point configuration; Secondly, the Kriging surrogate model of initial sample point configuration parameters, efficiency value and total pressure of volute is constructed, the high-precision Kriging surrogate model is used as the fitness function of NSGA-II algorithm to get the optimal solution. The rationality of the above method is verified by optimizing the 9-19.4A type centrifugal fan volute. The efficiency of the optimized fan under working conditions is increased by 1%, and the total pressure under working conditions is not reduced.

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"Chapter 15. C&S of Fans and Centrifugal Blowers." In Process Machinery, 435–51. De Gruyter, 2021. http://dx.doi.org/10.1515/9783110701074-015.

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Тези доповідей конференцій з теми "Centrifugal blower"

Banks, Christopher L., and Sean F. Wu. "Investigation of Centrifugal Blower Noise." In ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-0537.

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Abstract This paper presents the results of an investigation of centrifugal blower noise. Experiments on three different types of blowers were conducted to determine the major noise generation mechanisms. The information thus gained has led to an innovative noise reduction method utilizing a stationary, non-contacting transition mesh. Experiments showed that an overall noise reduction of up to 4 dB(A) was achieved for the blowers running at impeller tip speeds of 10 to 30 (m/s). In addition, a semi-analytical model was developed to predict the noise spectra from dimensionally similar blowers. This model yielded an acoustic power proportional to the fourth power of the blower speeds. Comparisons of the calculated and measured noise spectra from different blowers running under various speeds were demonstrated. Good agreements were obtained in all cases.

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Banks, Christopher L., and Sean F. Wu. "Investigation of Centrifugal Blower Noise." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0188.

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Abstract This paper presents the results of an ongoing investigation of noise radiation from centrifugal blowers used in passenger vehicles. The semi-empirical formulation previously derived by the authors (1998) for predicting noise spectra of centrifugal blowers running in a free field is extended to centrifugal blowers installed in a HVAC scroll housing. Because of the presence of the scroll and cutoff, the flow fields are different from those in a free field. Accordingly, the noise generation mechanisms become much more difficult to analyze and model. The previous model assumed a monopole type sound radiation pattern, and predicted the broadband component of the noise spectra well. This model is extended to include the contributions of both monopole and directional dipole sound radiation. It is this complex radiation that is characteristic of a centrifugal blower situated inside a scroll housing with a cutoff. Comparisons of the calculated and measured noise spectra were demonstrated, and good agreements were obtained in all cases.

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Funabashi, Shigehisa, Takeshi Honda, Nobuyuki Isoshima, Yoshihiro Takada, Masayuki Suganami, and Yasuyuki Nakano. "Small Two-Stage Centrifugal Blowers." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82181.

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We surveyed small two-stage centrifugal blowers, specifically their static parts and silencers. One of their features was a simple diffuser without a division plate between two centrifugal impellers instead of the normal return channel. Variety chord return vanes that gradually shorten along airflow passes are efficient for our characteristic diffuser channel. Diffuser vanes are efficient for increasing the pressure of a blower only behind the first impeller. If they are behind the second impeller, they cause the pressure of the blower to fall. We designed an original suction-side silencer with channels of two different lengths. The difference in the lengths was aligned to a half wavelength of the main noise, specifically the blade passage frequency noise. With our silencer, sound waves of different phases canceled each other out at the inlet of the blower. As a result, the noise of the blowers was reduced to 18 dB.

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Kidwai, Ahmad Saaduddin, and George Zimmermann. "Centrifugal Blower Troubleshoot, Repair and Improved Reliability." In 2021 International Conference on Maintenance and Intelligent Asset Management (ICMIAM). IEEE, 2021. http://dx.doi.org/10.1109/icmiam54662.2021.9715198.

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Howard, Jonathon, and Abraham Engeda. "Analysis and Design of Centrifugal Blowers for the Pressure Ratio Range 1.2 - 1.8." In ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/gt2021-59821.

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Abstract Centrifugal/centrifugal compressor designs within pressure ratio range of 2.0–4.0 have well-established guidelines for most common gases, and it is possible to determine optimum compressor geometry for numerous applications as characterized by specific speed or flow coefficient. Specific speed can be correlated to various combinations of inlet tip-exit diameter ratio, inlet hub-tip diameter ratio, blade exit back-sweep, and inlet-tip absolute tangential velocity for solid body pre-whirl. For centrifugal compressors in the pressure ratio range of 1.2–1.8, commonly known as blowers, there lacks organized and systematic optimum design procedures. Blowers, among many others uses, are widely used in HVAC, and provide air for ventilation and industrial process requirements. Due to broad applications in industry, blowers comprise an important sub-group of turbomachinery. This paper provides analysis and design data for blowers in the pressure ratio range of 1.2–1.8. Specific speed is determined from the data provided, and accurate correlations to possible achievable maximum efficiencies are established within a good operational range. Furthermore, plots of impeller exit flow angle, inlet tip-exit diameter ratio, inlet hub-tip diameter ratio, head coefficient, and blade exit back-sweep are provided over a range of specific speeds for various tip speeds to permit rapid selection of optimum blower size and shape for a variety of applications. The design procedure follows a method that enables efficient blade passage sizing. When the blower inlet and outlet velocities, diameters, blade widths, and blade angles are determined and fixed, the blade passage and profile will be sized by applying an energy, momentum, and continuity balance analysis. The application of these equations equates the proper pressure and velocity distribution throughout the blower impeller. Generally, the passage is designed to accommodate an optimum prescribed diffusion rate.

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Kowshik, C. K. P., Daisuke Tsugita, Yusuke Takeyama, and Yutaka Ohta. "Rotating Instability in a Centrifugal Blower With Shrouded Impeller." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68266.

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Rotating instability in various types of fans, compressors, and pumps is considered as one of the symptoms of unsteady phenomena such as rotating stall or surge, and it is observed before a rotating stall as an amplitude increase in the power spectra of velocity fluctuation and/or radiated noise. In this paper, the cause of rotating instability in a centrifugal blower with a shrouded impeller is investigated through both experiments and numerical simulations. Experimental results show that the rotating instability may be attributed to unsteady vortices rotating along the impeller periphery and that a discrete noise component induced by the rotating instability is mainly caused by the interaction between unsteady vortices and the impeller discharge flow. A significant amplitude increase within a frequency band at almost half the blade passing frequency is found to be caused by an irregular change in the vortex rotating speed as well as by an irregular time interval in the train of generated vortices. In the numerical study, the structure and circumferential characteristics of the rotating vortices are investigated by a visualization technique using Q-definition. Circumferential characteristics of the rotating vortices may be largely influenced by the steady characteristics of the impeller discharge flow field, which are determined by the geometric configuration of the impeller and the scroll casing.

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Chen, Jiandong, Beibei Sun, Jianrun Zhang, Fei Xue, and Xin Liu. "Experimental and Numerical Investigation of the Aerodynamic Noise Radiated From a Centrifugal Blower." In ASME 2015 Noise Control and Acoustics Division Conference at InterNoise 2015. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ncad2015-5916.

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Centrifugal blowers are widely used as garden machines, however, the aerodynamic noise generated by these machines cause serious problems. Although many researches focus on the generation mechanism and prediction method of centrifugal fan noise, most of these researches analysis the simplified centrifugal fan models and ignore the diffraction and scattering effect. In this paper, both experimental and numerical methods are carried out to analysis and measure the aerodynamic noise of the centrifugal blower. In order to calculate the flow field, a CFD (Computational Fluid Dynamics) numerical model is established, and the LES (Large Eddy Simulation) model is used to solve the three-dimensional unsteady flow, while the FW-H (Ffows Williams-Hawkings) model is used to calculate the acoustic source. To consider the diffraction and scattering effect, a BEM method is used to predict the sound radiated from the blower. A parallel experiment is carried out to measure the aerodynamic noise in a semi-anechoic room, and the numerical result shows a good agreement with the experiment result. The effect of outlet and inlet ducts on the sound radiation of the centrifugal blower is also investigated in this paper.

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Jang, Choon-Man, Jong-Sung Lee, and Sang-Ho Yang. "Performance Evaluation of a Centrifugal Blower Using Optimal Design Method." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16449.

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Effects of design variables on the performance of a centrifugal blower have been analyzed based on the three-dimensional flow analysis. Two design parameters defined the shape of a volute casing are introduced to enhance a blower performance. To analyze three-dimensional flow field in the centrifugal blower, general analysis code, CFX, is employed in the present work. SST turbulence model is employed to estimate the eddy viscosity. Boundary condition at the interference plane between rotational and stationary domains is applied by a stage method. Unstructured grids are used to represent a composite grid system including blade, casing and inlet guide. In the present study, throughout the shape optimization of the centrifugal blower at the design flow condition, the blower efficiency and pressure are successfully increased by 0.5 and 1.6 percent compared to reference one. It is found that the casing height of design variables is more sensitive on the object function of efficiency compared to that of the casing width. And secondary flow due to velocity gradient and low velocity region increase pressure loss, leading to make low efficiency. Detailed flow field inside a centrifugal blower is also analyzed and compared.

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Stajuda, Mateusz, Grzegorz Liskiewicz, and David Garcia. "Flow Instabilities Detection in Centrifugal Blower Using Empirical Mode Decomposition." In GPPS Beijing19. GPPS, 2019. http://dx.doi.org/10.33737/gpps19-bj-222.

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Botros, Monier B., Thomas M. Beaudoin, and Ming-Chia Lai. "New Design Features of Centrifugal Blower Systems to Improve its Airflow Performance and Power Consumption." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-1223.

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Abstract A parametric study is carried out to screen the effects of HVAC blower housing volute, scroll, design parameters on its performance. The results of statistic regression analysis, mathematical models and prediction correlation to test data are included and discussed. Blower airflow field is inspected by computational fluid dynamics (CFD) and Laser Doppler velocimetry (LDV) to define its deficiencies. New design features for blower scrolls are developed to resolve the flow deficiencies, in order to minimize the blower energy losses, vibrations and air-rush noise. Flow field improvements are illustrated. Blower performance with the new design features is compared to the performance of the previous design art known as “standard blower” designs. Airflow capacity of the new designs is higher than that of a standard design of one degree larger in size, within the operating range of automotive air-handling systems. Blower efficiency is increased by 3 to 8% over a wider airflow range. The effects of scroll size and exit design on the performance of the new scroll designs are illustrated and discussed.

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