air jordan shoes cheap Volute centrifugal fan vari

Scroll variant line of improved performance of centrifugal fan

. 32Pa, 83% maximum efficiency. Static pressure increased with the improvement of 10.4% compared with that before, the total pressure increase of 6.4%, 2.6% efficiency. The performance of full scale figure also shows the curve: improved fan total pressure near the design condition improved significantly, but in a more improved performance of high flow decreased before, also shows the relative efficiency curve 35, 2007 Volume 4 5 of fluid machinery with the distribution trend. Yong Cliff O. Jun 9 hanging O. 7 Ji 0.55O9O13O volume flow m / rain) Figure 10, the improved fan total pressure curve 9O13O volume flow m / min) 11 fans before and after improvement of the efficiency curve analysis of this variant lines may be due to better meet the design work after the scroll state of flow requirements, while the high flow condition, due to contraction of Volute were amended, making the spiral flow within the larger increase, leading to the flow velocity is proportional to the square of losses,[link widoczny dla zalogowanych], including friction, impact and other losses increased significantly . Since in practical applications, the fan always runs the main design conditions, so although in slightly lower performance of high flow, but does not affect the operation of the fan performance improvement. 5 Conclusion computational fluid dynamics method,[link widoczny dla zalogowanych], centrifugal blower machine was three-dimensional, numerical simulation of compressible turbulent flow, calculated by comparing the fan performance curve and test results to verify the reliability and accuracy of numerical simulation. By analyzing the fan, including the relative velocity vector, pressure, changes in distribution of flow parameters for flow problems with variable Volute approach to improving the performance of centrifugal fan flow purposes. Further research is on this basis, numerical and experimental study of sound, clear spiral flow performance of the fan laws. References [1] Li Qingyi. Fan [M]. Wuhan: Huazhong Institute of Technology, 1992. [2] VanDoormalJP, RathbyGG. EnhancementoftheSIMPLEmethodforpredictingincompressiblefluidflows [J]. NumericalHeatTransfer, 1984,7:147.163. [3] Tao Wen-Quan. Numerical Heat Transfer [M]. Xi'an: Xi'an Jiaotong University Press,[link widoczny dla zalogowanych], 2004. [4] LaunderDB. Thenumericalcomputationofturbulentflows [J]. ComputMethodsApplMechEng, 1974,3:269.289. Author: Sun Changhui (1979 -), female, Master, address: 300072, Tianjin University, Tianjin Institute of Mechanics, Department of Mechanical Engineering. (Continued from page Cool

[1] Nico. Permanent magnet linear motor-driven compressor theoretical analysis and experimental study of [D]. Xi'an: Xi'an Jiaotong University, 2003. [2] LamantiaM, ContarniA, GovanniS. NumericalandExperimentalAnalysisofaLinearCompressor [A]. JamesEBraun. 16thInternationalCompressorEngi-neeringConference [C]. US: PurdueUniv, 2002. C23-2. [3] LG Electronics Corporation. Used to control the linear position of the piston compressor devices and method of [P]. China. Patents, No. 00818510.7.2003. [4] SunpowerInc, AthensOhio. M ~ hodandapparatusformeasuringpistonpositioninafreepistoncompresor [P]. US. Patent, No. 5496153.1996. [5] Ye Yunyue,[link widoczny dla zalogowanych], Lu Qinfen, Fan Chengzhi, et al. Linear Motor Technical Manual [M]. Beijing: Mechanical Industry Press, 2003.92.120. [6] Tan Zuowu, Lingjin Fu, Yun Jialing, et al. Reciprocating motor [M]. Beijing: Beijing Press ,1991.35-48. [7] Wang Jiansheng. Linear induction motor piston compressor Theoretical and experimental study [D]. Chongqing: Chongqing University Press. 1998. About the author: Zhang Rights (1980.), Male, Ph.D.,[link widoczny dla zalogowanych], Address: Xi'an Jiaotong University, Xi'an, Shaanxi Institute of compressor dynamic Institute.

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