... distortion as compared with counter-rotating inflow distortion. aerodynamics blades compressors fans flow measurement rotational flow turbomachinery wavelet transforms flow instability rotating stall static inflow distortion dynamic inflow distortion stall inception Stable...

...Semi Kim; Junyoung Park; Kukyoung Ahn; Jehyun Baek In centrifugal compressors, the diffuser and the volute have strong influences on the flow discharged from the impeller and thus also on the performance. In particular, a key parameter is the radial velocity at the volute inlet; it determines...

...Seung Chul Back; June Hyuk Sohn; Seung Jin Song This paper presents an experimental investigation of roughness effects on aerodynamic performance in a low-speed linear compressor cascade. Equivalent sandgrain roughnesses of 12 μ m , 180 μ m , 300 μ m , 425 μ m , and 850 μ m have been tested...

...Young-Seok Kang; Shin-Hyoung Kang It is well-known that nonuniform tip clearance in an axial compressor induces pressure and velocity perturbations along the circumferential direction. This study develops a numerical modeling to predict perturbed flows in an axial compressor with a nonuniform tip...

...Qiushi Li; Hong Wu; Ming Guo; Jie-Zhi Wu In a companion paper ( 2008, “Vorticity Dynamics in Axial Compressor Flow Diagnosis and Design,” ASME J. Fluids Eng., 130, p. 041102 ), a study has been made on the critical role of circumferential vorticity (CV) in the performance of axial compressor...

... of curve u scroll wrap type Creux , L. , 1905 , “ Rotary Engine ,” U.S. Patent No.801,182 . Zhenquan , L. , and Du Guirong , Q. Z. , 1994 , “ The Conjugacy Analysis of Modified Part of Scroll Profiles ,” Proceedings of the International Compressor Engineering...

...Hui Zhou; Zongchang Qu; Hua Yang; Bingfeng Yu The synchronal rotary compressor (SRC) has been developed to resolve high friction and severe wear that usually occur in conventional rotary compressors due to the high relative velocity between the key tribo-pairs. In this study, the working principle...

..., “Two-Equation Modeling of Turbulent Rotating Flows,” Phys. Fluids., 17, p. 055110) to the ( k , ϵ ) model. The method of verification and validation is applied to assess the impact of these corrections on the computation of a centrifugal-compressor test case. First, a review of RC effects on turbulence...

...Yantao Yang; Hong Wu; Qiushi Li; Sheng Zhou; Jiezhi Wu It is well recognized that vorticity and vortical structures appear inevitably in viscous compressor flows and have strong influence on the compressor performance. However, conventional analysis and design procedure cannot pinpoint...

...Chunwei Gu; Kazuo Yamaguchi; Toshio Nagashima; Hirotaka Higashimori Unsteady static pressure signals due to flow instability in two types of centrifugal compressors were analyzed by employing the phase portrait reconstruction method. The sampled data corresponded to several streamwise locations...

... of flow control used here is perceived to have applications in turbomachinery like turbines and compressors. 24 02 2006 05 05 2006 flow control flow separation vortices jets boundary layer turbulence flow visualisation turbines compressors aircraft S-duct diffusers...

...Yong Sang Yoon; Seung Jin Song; Hyoun-Woo Shin Experiments have been performed on the low speed research compressor (LSRC) at General Electric Aircraft Engines to investigate the effects of flow coefficient, stagger angle, and tip clearance on tip vortex. Time resolved casing pressure distributions...

...M. M. Cui Since scroll compressors contain gas pockets whose shapes and sizes change continuously, the flow fields inside the compressors are time dependent and three-dimensional. The spatial and temporal variations inside the gas pockets also induce unsteady flows between the gas pockets...

...), and the flow around a double circular arc (DCA) compressor cascade in quasi-off-design condition ( i = − 1.5 ° ) [ Zierke and Deutsch, NASA Contract Report 185118 (1989) ]. The comparison between computations and experiments shows a satisfactory performance of the HJ model in predicting complex turbomachinery...

...Joseph T. Hamrick Before and during World War II, the design and development of single stage high pressure ratio centrifugal compressors was essentially a cut-and-try exercise. To reach a high pressure without substantial experimentation required multiple stages of impellers and diffusers...

... in the order of 4545 kg ( 10,000 lb. ) . It is concluded that the resulting requirements for both the fuel consumption and engine thrust/weight ratio for such aircraft will require high compressor exit and turbine inlet temperatures, together with bypass ratios that are significantly higher than typical...

...A´rpa´d Veress; Rene´ Van den Braembussche The design and optimization of a multistage radial compressor vaneless diffuser, cross-over and return channel is presented. An analytical design procedure for 3D blades with prescribed load distribution is first described and illustrated by the design...

...Abraham Engeda; Yunbae Kim; Ronald Aungier; Gregory Direnzi The performance of centrifugal compressors can be seriously degraded by inlet flow distortions that result from an unsatisfactory inlet configuration. In this present work, the flow is numerically simulated and the flow details...

... method is applied to an impeller shown in Figs. 3 and 4 for which experimental results are available 20 . The impeller is a model of a gas compressor with blade count 12, inlet and outlet blade angles 32 and 45 degrees, respectively, and specific speed k = 2 π n Q / Δ E 3 / 4...

... by the interaction between a centrifugal impeller and diffuser vanes, using a Navier-Stokes code with standard k − ε turbulence model. Using a commercial code, Gu et al. succeeded in predicting the performance of a single-stage centrifugal compressor and studied the volute/diffuser flow in detail at design...