Статті в журналах з теми "Hollow fan blade"

Wide-Chord Hollow Fan Blade is One of the New Technologies Used in Aircraft Engines. in this Paper, the Modal Analysis Method is Used to Analyze the Influence of the Rib Number and the Rib Thickness to Wide-Chord Hollow Fan Blade Vibration Characteristics. the Result Shows that the Wide-Chord Hollow Fan Blades Greatly Improves the First-Order Vibration Frequency Compared with the Solid Blades, and the First-Order Vibration Frequency of the Wide-Chord Hollow Fan Blades is Reduced with the Increasing Rib Number which is Not Good for Vibration Elimination. the Wide-Chord Hollow Fan Blades’ Vibration Frequency Changes a Little when the Rib Number is Larger than Three. in Addition, the Rib Thickness has Smaller Effect on Wide-Chord Hollow Fan Blade.

Natural modes and frequencies of gas turbine engine hollow fan blades were experimentally investigated. The blades were produced with the method of super-plastic molding and pressure welding combination. Two independent experimental methods were used: three-component scanning laser vibrometry and impact modal analysis. Natural frequencies and vibration modes of a hollow fan blade and stress fields corresponding to the natural modes were got. The finite element modal analysis was carried out. The hollow fan blade was stated to have particular natural vibration modes. The investigation results can be used to detune the resonance vibrations and to verify calculation models.

This paper uses a typical section model to investigate analytically the effect of mass balancing as applied to hollow, supersonic fan blades. A procedure to determine the best configuration of an internal balancing mass to provide flutter alleviation is developed. This procedure is applied to a typical supersonic shroudless fan blade which is unstable both in the solid configuration and when it is hollow with no balancing mass. The addition of an optimized balancing mass is shown to stabilize the blade at the design condition.

An experimental proof-of-concept test was conducted to demonstrate rotor-stator interaction tone noise reduction through rotor trailing edge blowing. The velocity deficit from the viscous wake of the rotor blades was reduced by injecting air into the wake from a trailing edge slot. Composite hollow rotor blades with internal flow passages were designed based on Computational Fluid Dynamics codes modeling the internal flow. The hollow blade with interior guide vanes creates flow channels through which externally supplied air flows from the root of the blade to the trailing edge. The impact of the rotor wake-stator interaction on the acoustics was also predicted analytically. The Active Noise Control Fan, located at the NASA Glenn Research Center, was used as the proof-of-concept test bed. In-duct mode and farfield directivity acoustic data were acquired at blowing rates (defined as mass flow supplied to trailing edge blowing system divided by fan mass flow) ranging from 0.5% to 2.0%. The first three blade passing frequency harmonics at fan rotational speeds of 1700 to 1900 rpm were analyzed. The acoustic tone mode power levels (PWL) in the inlet and exhaust were reduced 11.5&–0.1, 7.2&11.4, 11.8&19.1 PWL dB, respectively. The farfield tone power levels at the first three harmonics were reduced 5.4, 10.6, & 12.4 dB PWL. At selected conditions, two-component hotwire and stator vane unsteady surface pressures were acquired. These measurements show the modification of the rotor wake due to trailing edge blowing and its effect on the stator vane to illustrate the physics behind the noise reduction.

Application of the conventional superplasticity (SP) allows producing the unique hollow structures. One remarkable example is the hollow titanium blade of the air engine fan produced by Rolls-Royce. However, high temperature titanium alloys processing (~ 927 °С) limits wide industrial application of the conventional SP. The solution of the mentioned issue can be found through the application of low-temperature SP. Ti-6Al-4V alloy with ultrafine grain structure at the temperature range of 600 ­ 800 °С has enough ductility resources for the superplastic forming (SPF) of the parts with the complicated shape. The formation of pores in Ti-6Al-4V alloy at uniaxial and biaxial tension at the temperature 600 °С is not observed. The effect of low-temperature SP also allows lowering pressure welding (PW) temperature essentially. Herewith, there is a possibility to produce the hollow parts by the combination of SPF and PW. The main goal is the optimization of the technological scheme and processing temperature. The use of the low-temperature SP provides high quality of hollow components such as blades.

Diffusion-bonded titanium hollow warren structures have been successfully applied in aircraft engine components, such as fan blade, and OGV, while the optimal design of the hollow warren structure to improve its impact resistance, especially under bird-strike event, has been a challenge. In this work, a series of impact tests and numerical simulations are carried out to investigate the effect of key geometric features on the overall impact strength of a panel-shaped titanium hollow warren structure. Based on experimental and numerical studies, a quantitative relationship between diffusion bonding seam strength and the overall impact strength is developed. Meanwhile, key geometric factors affecting the resultant bonding seam strength for a typical manufacturing process are identified. This work provides useful references for the optimal design to increase impact resistance for aircraft engine hollow warren structure components.

Axial flow fans are used in many fields in order to ensure the mass and heat transfer from air, chiefly in the heating, ventilation and air conditioning industry (HVAC). A more proper understanding of the airflow behavior through the systems is necessary to manage and optimize the fan operation. Computational fluid dynamics (CFD) represents a real tool providing the ability to access flow structures in areas that measuring equipment cannot reach. Reducing the leakage flow rate, inherent in operation, by synthetic-jet techniques improves performance. This paper presents the CFD results performed on a hollow blade fan developed by our team. The leakage flow is controlled by blowing air from 16 designated circular holes and arranged on the fan shroud. We discuss the results for two rotational speeds (1000 and 2000 rpm) and two injection rates (400 and 800 L/min). The numerical results consistent with the experimental show, for the low rotation speed and high injection ratio, significant gains in power (53%), torque (80%) and leakage flow rate (80%).

Electroplated profiled superabrasive grinding wheels which integrate both advantages of grinding and profile milling have been widely used in the machining process the wide chord hollow fan blade rabbets made of Ti-6Al-4V alloy. However, the employment of these tools has been impeded by drastic forces and thermal damage. In order to investigate the variation regularities of grinding forces and temperature with different machining parameters, experiments were carried out with single layer electroplated CBN grinding wheels. Grinding forces and temperature were measured and analyzed. Meanwhile, tool life and metallography of workpiece were studied. The results showed that higher spindle speed leads to lower forces and higher temperature. With the increase of feed rate and radial cutting depth, forces and temperature increase. Strong adherence of chips makes abrasives grits blunt which results in the increase of grinding forces after a great deal of tests. Metallographic structure of the machined workpiece is almost identical with the original sample.

In an axial fan, a leakage flow driven by a pressure gradient between the pressure side and the suction side occurs in the gap between the shroud and the casing. This leakage flow is in the opposite direction to the main flow and is responsible for significant energy dissipation. Therefore, many authors have worked to understand this phenomenon in order to reduce these inherent energy losses. Up to now, most of the studies reported in the literature have been passive solutions. In this paper, an experimental controlling strategy is suggested to reduce the leakage flow rate. To this end, a fan with hollow blades and a specific drive system were designed and built for air injection. Air is injected in the leakage gap at the fan periphery. The experiment was performed for three rotation speeds, five injection rates and two configurations: 16 and 32 injection holes on the fan’s circumference. The experimental results of this investigation are presented in this article.

Axial fans often show adverse flow conditions at the fan hub and at the tip of the blade. The modification of conventional axial fan blade is presented. Hollow blade was manufactured from the hub to the tip. It enables the formation of self-induced internal flow through internal passages. The internal flow enters the passage of the hollow blade through the opening near the fan hub and exits through the trailing edge slots at the tip of the hollow blade. The study of the influence of internal flow on the flow field of axial fan and modifications of axial fan aerodynamic characteristics is presented. The characteristics of the axial fan with the internal flow were compared to characteristics of a geometrically equivalent fan without internal flow. The results show integral measurements of performance testing using standardized test rig and the measurements of local characteristics. The measurements of local characteristics were performed with a hot-wire anemometry and a five-hole probe. Reduction in adverse flow conditions near the trailing edge at the tip of the hollow blade, boundary-layer reduction in the hollow blade suction side, and reduction in flow separation were attained. The introduction of the self-induced blowing led to the preservation of external flow direction defined by the blade geometry, which enabled maximal local energy conversion. The integral characteristic reached a higher degree of efficiency.

AbstractIn this paper, the concepts of nanotechnology-based fan blade have been introduced and CNT-reinforced hollow micro-balloon-based syntactic foams/composites and damping coatings have been applied so as to develop the next generation aerospace components. The focus in this paper is directed toward the development of the next generation of vibration damping systems, providing a road map to manufacturing technology and design solutions.

Introduction It has frequently been noted that ICTs and social networking applications have blurred the once-clear boundary between work, leisure and entertainment, just as they have collapsed the distinction between public and private space. While each individual has a sense of what “home” means, both in terms of personal experience and more conceptually, the following three examples of online interaction (based on participants’ interest, or involvement, in activities traditionally associated with the home: pet care, craft and cooking) suggest that the utilisation of online communication technologies can lead to refined and extended definitions of what “home” is. These examples show how online communication can assist in meeting the basic human needs for love, companionship, shelter and food – needs traditionally supplied by the home environment. They also provide individuals with a considerably expanded range of opportunities for personal expression and emotional connection, as well as creative and commercial production, than that provided by the purely physical (and, no doubt, sometimes isolated and isolating) domestic environment. In this way, these case studies demonstrate the interplay and melding of physical and virtual “home” as domestic practices leach from the most private spaces of the physical home into the public space of the Internet (for discussion, see Gorman-Murray, Moss, and Rose). At the same time, online interaction can assert an influence on activity within the physical space of the home, through the sharing of advice about, and modeling of, domestic practices and processes. A Dog’s (Virtual) Life The first case study primarily explores the role of online communities in the formation and expression of affective values and personal identity – as traditionally happens in the domestic environment. Garber described the 1990s as “the decade of the dog” (20), citing a spate of “new anthropomorphic” (22) dog books, Internet “dog chat” sites, remakes of popular classics such as Lassie Come Home, dog friendly urban amenities, and the meteoric rise of services for pampered pets (28-9). Loving pets has become a lifestyle and culture, witnessed and commodified in Pet Superstores as well as in dog collectables and antiques boutiques, and in publications like The Bark (“the New Yorker of Dog Magazines”) and Clean Run, the international agility magazine, Website, online book store and information gateway for agility products and services. Available online resources for dog lovers have similarly increased rapidly during the decade since Garber’s book was published, with the virtual world now catering for serious hobby trainers, exhibitors and professionals as well as the home-based pet lover. At a recent survey, Yahoo Groups – a personal communication portal that facilitates social networking, in this case enabling users to set up electronic mailing lists and Internet forums – boasted just over 9,600 groups servicing dog fanciers and enthusiasts. The list Dogtalk is now an announcement only mailing list, but was a vigorous discussion forum until mid-2006. Members of Dogtalk were Australian-based “clicker-trainers”, serious hobbyist dog trainers, many of whom operated micro-businesses providing dog training or other pet-related services. They shared an online community, but could also engage in “flesh-meets” at seminars, conferences and competitive dog sport meets. An author of this paper (Rutherford) joined this group two years ago because of her interest in clicker training. Clicker training is based on an application of animal learning theory, particularly psychologist E. F. Skinner’s operant conditioning, so called because of the trademark use of a distinctive “click” sound to mark a desired behaviour that is then rewarded. Clicker trainers tend to dismiss anthropomorphic pack theory that positions the human animal as fundamentally opposed to non-human animals and, thus, foster a partnership (rather than a dominator) mode of social and learning relationships. Partnership and nurturance are common themes within the clicker community (as well as in more traditional “home” locations); as is recognising and valuing the specific otherness of other species. Typically, members regard their pets as affective equals or near-equals to the human animals that are recognised members of their kinship networks. A significant function of the episodic biographical narratives and responses posted to this list was thus to affirm and legitimate this intra-specific kinship as part of normative social relationship – a perspective that is not usually validated in the general population. One of the more interesting nexus that evolved within Dogtalk links the narrativisation of the pet in the domestic sphere with the pictorial genre of the family album. Emergent technologies, such as digital cameras together with Web-based image manipulation software and hosting (as provided by portals like Photobucket and Flickr ) democratise high quality image creation and facilitate the sharing of these images. Increasingly, the Dogtalk list linked to images uploaded to free online galleries, discussed digital image composition and aesthetics, and shared technical information about cameras and online image distribution. Much of this cultural production and circulation was concerned with digitally inscribing particular relationships with individual animals into cultural memory: a form of family group biography (for a discussion of the family photograph as a display of extended domestic space, see Rose). The other major non-training thread of the community involves the sharing and witnessing of the trauma suffered due to the illness and loss of pets. While mourning for human family members is supported in the off-line world – with social infrastructure, such as compassionate leave and/or bereavement counselling, part of professional entitlements – public mourning for pets is not similarly supported. Yet, both cultural studies (in its emphasis on cultural memory) and trauma theory have highlighted the importance of social witnessing, whereby traumatic memories must be narratively integrated into memory and legitimised by the presence of a witness in order to loosen their debilitating hold (Felman and Laub 57). Postings on the progress of a beloved animal’s illness or other misfortune and death were thus witnessed and affirmed by other Dogtalk list members – the sick or deceased pet becoming, in the process, a feature of community memory, not simply an individual loss. In terms of such biographical narratives, memory and history are not identical: “Any memories capable of being formed, retained or articulated by an individual are always a function of socially constituted forms, narratives and relations … Memory is always subject to active social manipulation and revision” (Halbwachs qtd. in Crewe 75). In this way, emergent technologies and social software provide sites, akin to that of physical homes, for family members to process individual memories into cultural memory. Dogzonline, the Australian Gateway site for purebred dog enthusiasts, has a forum entitled “Rainbow Bridge” devoted to textual and pictorial memorialisation of deceased pet dogs. Dogster hosts the For the Love of Dogs Weblog, in which images and tributes can be posted, and also provides links to other dog oriented Weblogs and Websites. An interesting combination of both therapeutic narrative and the commodification of affect is found in Lightning Strike Pet Loss Support which, while a memorial and support site, also provides links to the emerging profession of pet bereavement counselling and to suppliers of monuments and tributary urns for home or other use. loobylu and Narratives of Everyday Life The second case study focuses on online interactions between craft enthusiasts who are committed to the production of distinctive objects to decorate and provide comfort in the home, often using traditional methods. In the case of some popular craft Weblogs, online conversations about craft are interspersed with, or become secondary to, the narration of details of family life, the exploration of important life events or the recording of personal histories. As in the previous examples, the offering of advice and encouragement, and expressions of empathy and support, often characterise these interactions. The loobylu Weblog was launched in 2001 by illustrator and domestic crafts enthusiast Claire Robertson. Robertson is a toy maker and illustrator based in Melbourne, Australia, whose clients have included prominent publishing houses, magazines and the New York Public Library (Robertson “Recent Client List” online). She has achieved a measure of public recognition: her loobylu Weblog has won awards and been favourably commented upon in the Australian press (see Robertson “Press for loobylu” online). In 2005, an article in The Age placed Robertson in the context of a contemporary “craft revolution”, reporting her view that this “revolution” is in “reaction to mass consumerism” (Atkinson online). The hand-made craft objects featured in Robertson’s Weblogs certainly do suggest engagement with labour-intensive pursuits and the construction of unique objects that reject processes of mass production and consumption. In this context, loobylu is a vehicle for the display and promotion of Robertson’s work as an illustrator and as a craft practitioner. While skills-based, it also, however, promotes a family-centred lifestyle; it advocates the construction by hand of objects designed to enhance the appearance of the family home and the comfort of its inhabitants. Its specific subject matter extends to related aspects of home and family as, in addition to instructions, ideas and patterns for craft, the Weblog features information on commercially available products for home and family, recipes, child rearing advice and links to 27 other craft and other sites (including Nigella Lawson’s, discussed below). The primary member of its target community is clearly the traditional homemaker – the mother – as well as those who may aspire to this role. Robertson does not have the “celebrity” status of Lawson and Jamie Oliver (discussed below), nor has she achieved their market saturation. Indeed, Robertson’s online presence suggests a modest level of engagement that is placed firmly behind other commitments: in February 2007, she announced an indefinite suspension of her blog postings so that she could spend more time with her family (Robertson loobylu 17 February 2007). Yet, like Lawson and Oliver, Robertson has exploited forms of domestic competence traditionally associated with women and the home, and the non-traditional medium of the Internet has been central to her endeavours. The content of the loobylu blog is, unsurprisingly, embedded in, or an accessory to, a unifying running commentary on Robertson’s domestic life as a parent. Miles, who has described Weblogs as “distributed documentaries of the everyday” (66) sums this up neatly: “the weblogs’ governing discursive quality is the manner in which it is embodied within the life world of its author” (67). Landmark family events are narrated on loobylu and some attract deluges of responses: the 19 June 2006 posting announcing the birth of Robertson’s daughter Lily, for example, drew 478 responses; five days later, one describing the difficult circumstances of her birth drew 232 comments. All of these comments are pithy, with many being simple empathetic expressions or brief autobiographically based commentaries on these events. Robertson’s news of her temporary retirement from her blog elicited 176 comments that both supported her decision and also expressed a sense of loss. Frequent exclamation marks attest visually to the emotional intensity of the responses. By narrating aspects of major life events to which the target audience can relate, the postings represent a form of affective mass production and consumption: they are triggers for a collective outpouring of largely homogeneous emotional reaction (joy, in the case of Lily’s birth). As collections of texts, they can be read as auto/biographic records, arranged thematically, that operate at both the individual and the community levels. Readers of the family narratives and the affirming responses to them engage in a form of mass affirmation and consumerism of domestic experience that is easy, immediate, attractive and free of charge. These personal discourses blend fluidly with those of a commercial nature. Some three weeks after loobylu announced the birth of her daughter, Robertson shared on her Weblog news of her mastitis, Lily’s first smile and the family’s favourite television programs at the time, information that many of us would consider to be quite private details of family life. Three days later, she posted a photograph of a sleeping baby with a caption that skilfully (and negatively) links it to her daughter: “Firstly – I should mention that this is not a photo of Lily”. The accompanying text points out that it is a photo of a baby with the “Zaky Infant Sleeping Pillow” and provides a link to the online pregnancystore.com, from which it can be purchased. A quotation from the manufacturer describing the merits of the pillow follows. Robertson then makes a light-hearted comment on her experiences of baby-induced sleep-deprivation, and the possible consequences of possessing the pillow. Comments from readers also similarly alternate between the personal (sharing of experiences) to the commercial (comments on the product itself). One offshoot of loobylu suggests that the original community grew to an extent that it could support specialised groups within its boundaries. A Month of Softies began in November 2004, describing itself as “a group craft project which takes place every month” and an activity that “might give you a sense of community and kinship with other similar minded crafty types across the Internet and around the world” (Robertson A Month of Softies online). Robertson gave each month a particular theme, and readers were invited to upload a photograph of a craft object they had made that fitted the theme, with a caption. These were then included in the site’s gallery, in the order in which they were received. Added to the majority of captions was also a link to the site (often a business) of the creator of the object; another linking of the personal and the commercial in the home-based “cottage industry” sense. From July 2005, A Month of Softies operated through a Flickr site. Participants continued to submit photos of their craft objects (with captions), but also had access to a group photograph pool and public discussion board. This extension simulates (albeit in an entirely visual way) the often home-based physical meetings of craft enthusiasts that in contemporary Australia take the form of knitting, quilting, weaving or other groups. Chatting with, and about, Celebrity Chefs The previous studies have shown how the Internet has broken down many barriers between what could be understood as the separate spheres of emotional (that is, home-based private) and commercial (public) life. The online environment similarly enables the formation and development of fan communities by facilitating communication between those fans and, sometimes, between fans and the objects of their admiration. The term “fan” is used here in the broadest sense, referring to “a person with enduring involvement with some subject or object, often a celebrity, a sport, TV show, etc.” (Thorne and Bruner 52) rather than focusing on the more obsessive and, indeed, more “fanatical” aspects of such involvement, behaviour which is, increasingly understood as a subculture of more variously constituted fandoms (Jenson 9-29). Our specific interest in fandom in relation to this discussion is how, while marketers and consumer behaviourists study online fan communities for clues on how to more successfully market consumer goods and services to these groups (see, for example, Kozinets, “I Want to Believe” 470-5; “Utopian Enterprise” 67-88; Algesheimer et al. 19-34), fans regularly subvert the efforts of those urging consumer consumption to utilise even the most profit-driven Websites for non-commercial home-based and personal activities. While it is obvious that celebrities use the media to promote themselves, a number of contemporary celebrity chefs employ the media to construct and market widely recognisable personas based on their own, often domestically based, life stories. As examples, Jamie Oliver and Nigella Lawson’s printed books and mass periodical articles, television series and other performances across a range of media continuously draw on, elaborate upon, and ultimately construct their own lives as the major theme of these works. In this, these – as many other – celebrity chefs draw upon this revelation of their private lives to lend authenticity to their cooking, to the point where their work (whether cookbook, television show, advertisement or live chat room session with their fans) could be described as “memoir-illustrated-with-recipes” (Brien and Williamson). This generic tendency influences these celebrities’ communities, to the point where a number of Websites devoted to marketing celebrity chefs as product brands also enable their fans to share their own life stories with large readerships. Oliver and Lawson’s official Websites confirm the privileging of autobiographical and biographical information, but vary in tone and approach. Each is, for instance, deliberately gendered (see Hollows’ articles for a rich exploration of gender, Oliver and Lawson). Oliver’s hip, boyish, friendly, almost frantic site includes the what are purported-to-be self-revelatory “Diary” and “About me” sections, a selection of captioned photographs of the chef, his family, friends, co-workers and sponsors, and his Weblog as well as footage streamed “live from Jamie’s phone”. This self-revelation – which includes significant details about Oliver’s childhood and his domestic life with his “lovely girls, Jools [wife Juliette Norton], Poppy and Daisy” – completely blurs the line between private life and the “Jamie Oliver” brand. While such revelation has been normalised in contemporary culture, this practice stands in great contrast to that of renowned chefs and food writers such as Elizabeth David, Julia Child, James Beard and Margaret Fulton, whose work across various media has largely concentrated on food, cooking and writing about cooking. The difference here is because Oliver’s (supposedly private) life is the brand, used to sell “Jamie Oliver restaurant owner and chef”, “Jamie Oliver cookbook author and TV star”, “Jamie Oliver advertising spokesperson for Sainsbury’s supermarket” (from which he earns an estimated £1.2 million annually) (Meller online) and “Jamie Oliver social activist” (made MBE in 2003 after his first Fifteen restaurant initiative, Oliver was named “Most inspiring political figure” in the 2006 Channel 4 Political Awards for his intervention into the provision of nutritious British school lunches) (see biographies by Hildred and Ewbank, and Smith). Lawson’s site has a more refined, feminine appearance and layout and is more mature in presentation and tone, featuring updates on her (private and public) “News” and forthcoming public appearances, a glamorous selection of photographs of herself from the past 20 years, and a series of print and audio interviews. Although Lawson’s children have featured in some of her television programs and her personal misfortunes are well known and regularly commented upon by both herself and journalists (her mother, sister and husband died of cancer) discussions of these tragedies, and other widely known aspects of her private life such as her second marriage to advertising mogul Charles Saatchi, is not as overt as on Oliver’s site, and the user must delve to find it. The use of Lawson’s personal memoir, as sales tool, is thus both present and controlled. This is in keeping with Lawson’s professional experience prior to becoming the “domestic goddess” (Lawson 2000) as an Oxford graduated journalist on the Spectator and deputy literary editor of the Sunday Times. Both Lawson’s and Oliver’s Websites offer readers various ways to interact with them “personally”. Visitors to Oliver’s site can ask him questions and can access a frequently asked question area, while Lawson holds (once monthly, now irregularly) a question and answer forum. In contrast to this information about, and access to, Oliver and Lawson’s lives, neither of their Websites includes many recipes or other food and cooking focussed information – although there is detailed information profiling their significant number of bestselling cookbooks (Oliver has published 8 cookbooks since 1998, Lawson 5 since 1999), DVDs and videos of their television series and one-off programs, and their name branded product lines of domestic kitchenware (Oliver and Lawson) and foodstuffs (Oliver). Instruction on how to purchase these items is also featured. Both these sites, like Robertson’s, provide various online discussion fora, allowing members to comment upon these chefs’ lives and work, and also to connect with each other through posted texts and images. Oliver’s discussion forum section notes “this is the place for you all to chat to each other, exchange recipe ideas and maybe even help each other out with any problems you might have in the kitchen area”. Lawson’s front page listing states: “You will also find a moderated discussion forum, called Your Page, where our registered members can swap ideas and interact with each other”. The community participants around these celebrity chefs can be, as is the case with loobylu, divided into two groups. The first is “foodie (in Robertson’s case, craft) fans” who appear to largely engage with these Websites to gain, and to share, food, cooking and craft-related information. Such fans on Oliver and Lawson’s discussion lists most frequently discuss these chefs’ television programs and books and the recipes presented therein. They test recipes at home and discuss the results achieved, any problems encountered and possible changes. They also post queries and share information about other recipes, ingredients, utensils, techniques, menus and a wide range of food and cookery-related matters. The second group consists of “celebrity fans” who are attracted to the chefs (as to Robertson as craft maker) as personalities. These fans seek and share biographical information about Oliver and Lawson, their activities and their families. These two areas of fan interest (food/cooking/craft and the personal) are not necessarily or always separated, and individuals can be active members of both types of fandoms. Less foodie-orientated users, however (like users of Dogtalk and loobylu), also frequently post their own auto/biographical narratives to these lists. These narratives, albeit often fragmented, may begin with recipes and cooking queries or issues, but veer off into personal stories that possess only minimal or no relationship to culinary matters. These members also return to the boards to discuss their own revealed life stories with others who have commented on these narratives. Although research into this aspect is in its early stages, it appears that the amount of public personal revelation either encouraged, or allowed, is in direct proportion to the “open” friendliness of these sites. More thus are located in Oliver’s and less in Lawson’s, and – as a kind of “control” in this case study, but not otherwise discussed – none in that of Australian chef Neil Perry, whose coolly sophisticated Website perfectly complements Perry’s professional persona as the epitome of the refined, sophisticated and, importantly in this case, unapproachable, high-end restaurant chef. Moreover, non-cuisine related postings are made despite clear directions to the contrary – Lawson’s site stating: “We ask that postings are restricted to topics relating to food, cooking, the kitchen and, of course, Nigella!” and Oliver making the plea, noted above, for participants to keep their discussions “in the kitchen area”. Of course, all such contemporary celebrity chefs are supported by teams of media specialists who selectively construct the lives that these celebrities share with the public and the postings about others’ lives that are allowed to remain on their discussion lists. The intersection of the findings reported above with the earlier case studies suggests, however, that even these most commercially-oriented sites can provide a fruitful data regarding their function as home-like spaces where domestic practices and processes can be refined, and emotional relationships formed and fostered. In Summary As convergence results in what Turow and Kavanaugh call “the wired homestead”, our case studies show that physically home-based domestic interests and practices – what could be called “home truths” – are also contributing to a refiguration of the private/public interplay of domestic activities through online dialogue. In the case of Dogtalk, domestic space is reconstituted through virtual spaces to include new definitions of family and memory. In the case of loobylu, the virtual interaction facilitates a development of craft-based domestic practices within the physical space of the home, thus transforming domestic routines. Jamie Oliver’s and Nigella Lawson’s sites facilitate development of both skills and gendered identities by means of a bi-directional nexus between domestic practices, sites of home labour/identity production and public media spaces. As participants modify and redefine these online communities to best suit their own needs and desires, even if this is contrary to the stated purposes for which the community was instituted, online communities can be seen to be domesticated, but, equally, these modifications demonstrate that the activities and relationships that have traditionally defined the home are not limited to the physical space of the house. While virtual communities are “passage points for collections of common beliefs and practices that united people who were physically separated” (Stone qtd in Jones 19), these interactions can lead to shared beliefs, for example, through advice about pet-keeping, craft and cooking, that can significantly modify practices and routines in the physical home. Acknowledgments An earlier version of this paper was presented at the Association of Internet Researchers’ International Conference, Brisbane, 27-30 September 2006. 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The Wired Homestead: An MIT Press Sourcebook on the Internet and the Family. Cambridge, MA: MIT Press, 2003. Citation reference for this article MLA Style Brien, Donna Lee, Leonie Rutherford, and Rosemary Williamson. "Hearth and Hotmail: The Domestic Sphere as Commodity and Community in Cyberspace." M/C Journal 10.4 (2007). echo date('d M. Y'); ?> <http://journal.media-culture.org.au/0708/10-brien.php>. APA Style Brien, D., L. Rutherford, and R. Williamson. (Aug. 2007) "Hearth and Hotmail: The Domestic Sphere as Commodity and Community in Cyberspace," M/C Journal, 10(4). Retrieved echo date('d M. Y'); ?> from <http://journal.media-culture.org.au/0708/10-brien.php>.