Influence of volute distortion on the performance of turbocharger centrifugal compressor with vane diffuser

2013 ◽  
Vol 56 (11) ◽  
pp. 2778-2786 ◽  
Author(s):  
XinQian Zheng ◽  
Lei Jin ◽  
Hideaki Tamaki
Keyword(s):  
Centrifugal Compressor ◽  
Vane Diffuser

scholarly journals Simulation of gas-dynamic characteristics of a centrifugal compressor vane diffuser using neural networks

2019 ◽  
Vol 140 ◽  
pp. 05003 ◽  
Author(s):  
Aleksandr Nikiforov ◽  
Alexei Kuchumov ◽  
Sergei Terentev ◽  
Evgeniy Petukhov ◽  
Kirill Kabalyk
Keyword(s):  
Neural Network ◽  
Centrifugal Compressor ◽  
Computational Experiment ◽  
Network Models ◽  
Intermediate Stage ◽  
Neural Network Models ◽  
Peter The Great ◽  
Gas Dynamic ◽  
The Neural Network ◽  
Vane Diffuser

The paper presents the results of mathematical simulation of the characteristics of a vane diffuser of a centrifugal compressor intermediate stage, such as the loss coefficient and the deviation angle versus the outlet vane angle of the diffuser. The simulation of these characteristics was made on the basis of processing the results of studies performed by the Research Laboratory “Gas Dynamics of Turbomachines” of Peter the Great St.Petersburg Polytechnic University at the model characteristics of vane diffusers. Given the almost complete absence of recommendations in the literature, the paper describes the technology for constructing neural network models, which includes preparing a sample of input data and determining the optimal structure of the neural network. Based on the obtained mathematical models, a computational experiment was carried out in order to determine the influence of the main geometric and gas-dynamic parameters on the efficiency of vane diffusers. The results of the computational experiment on neural models of the efficiency of a vane diffuser are analyzed according to the existing ideas about the physics of the processes of energy conversion in a vane diffuser.

An experimental investigation of a centrifugal compressor with hub vane diffusers

1997 ◽  
Vol 211 (5) ◽  
pp. 411-427 ◽  
Author(s):  
N Sitaram ◽  
J M Issac
Keyword(s):  
Centrifugal Compressor ◽  
Static Pressure ◽  
Pressure Coefficient ◽  
Experimental Studies ◽  
Pressure Rise ◽  
Leading Edge ◽  
Maximum Flow ◽  
Throat Region ◽  
Volume Range ◽  
Vane Diffuser

The present investigation reports results of experimental studies on a centrifugal compressor equipped with hub vane diffusers. The diffuser vane height ( h/b) is varied as follows: 0 (vaneless), 0.2, 0.3, 0.4 and 1 (vane). The experiments were carried out on a low specific speed centrifugal compressor with a radial tipped impeller with an inducer at the inlet. The measurements consist of determining performance characteristics, measuring static pressures on the hub and shroud and flow traverses with a precalibrated cobra probe at the diffuser exit over one passage at five flow coefficients, viz. φ = 0.23 (near surge), 0.34 (near peak pressure rise), 0.45, 0.60 and 0.75 (near maximum flow). The peak energy coefficient is maximum for the hub vane diffuser with an h/b ratio of 0.2. The hub vane diffusers have a wider operating range than the vane diffuser. At high flow coefficients, the static pressure rise is substantially low at the throat region of the vane diffuser as the incidence on to the vane leading edge is very high. The mass averaged static pressure coefficient is high in the low-volume range for the hub vane diffuser of h/b = 0.3, but in the high-volume range it is high for the vaneless diffuser.

Effect of a volute on the unsteady flow in the vane diffuser of a centrifugal compressor

2016 ◽  
Vol 230 (8) ◽  
pp. 773-791 ◽  
Author(s):  
Gong W Qi ◽  
X Hong Zhang
Keyword(s):  
Mass Flow ◽  
Centrifugal Compressor ◽  
Total Pressure ◽  
Pressure Ratio ◽  
Operating Conditions ◽  
High Mass ◽  
Flow Conditions ◽  
Asymmetric Component ◽  
Unsteady Loading ◽  
Vane Diffuser

A volute is the only circumferential asymmetric component in a centrifugal compressor, and thus, it should account for the circumferential asymmetry of the flow in a vane diffuser. This study performs a transient numerical analysis to investigate the effect of a volute on the flow in the vane diffuser of a centrifugal compressor under three operating conditions (near-stall, middle, and high mass flow). We compare numerical and experimental performance of the compressor, including polytropic efficiency, total pressure ratio, and unsteady pressure on a diffuser vane. The numerical scheme is proven valid owing to the fact that the numerical and experimental results considerably agree well with each other. Under middle and high mass flow conditions, the time-averaged static pressure recovery and the total pressure loss coefficients for all the diffuser passages indicate that the performance of the passages near and upstream of the volute tongue is affected negatively by the volute, whereas that of the passages downstream of the volute tongue is less affected. Under near-stall condition, the performance of all the passages is disturbed, and the diffuser passage marked as DP 3 demonstrates the worst performance. Investigation on the time-averaged aerodynamic forces, loading, and pressure on the vanes yields results that are consistent with those of the investigation on the performance of the passages. The harmonics with 0.5 fb and fb, which are included in the unsteady loading and pressure on the pressure and suction sides of the vanes, are dominant, where fb is the impeller main and splitter blades passing frequency. Their amplitude values increase as mass flow deviates from the middle mass flow condition. Under middle and high mass flow conditions, the harmonic with 0.5 fb is affected more negatively because of the larger amplitude on the vanes near and upstream of the volute tongue than those downstream, whereas the harmonic with fb is less affected by the volute. Under the near-stall condition, the transient vorticity fields along with the harmonics of 0.5 fb and fb are investigated to evaluate the performance of the diffuser passages. DP 3, which is located at approximately 90° downstream of the volute tongue, suffers the strongest flow deterioration and is inferred to stall first. Further researches for designing more matching diffuser/volute combination will be performed by referring this study.

Parametric study of centrifugal compressor stage vane diffuser characteristics by CFD methods

2020 ◽  
Author(s):  
Yu. B. Galerkin ◽  
A. A. Drozdov ◽  
E. P. Petukhov ◽  
V. B. Semenovsky ◽  
A. A. Ucehovscy
Keyword(s):  
Centrifugal Compressor ◽  
Parametric Study ◽  
Compressor Stage ◽  
Centrifugal Compressor Stage ◽  
Vane Diffuser

Performance and wall static pressure measurements on centrifugal compressor diffusers

2003 ◽  
Vol 217 (5) ◽  
pp. 547-558 ◽  
Author(s):  
J. M. Issac ◽  
N Sitaram ◽  
M Govardhan
Keyword(s):  
Centrifugal Compressor ◽  
Static Pressure ◽  
Experimental Studies ◽  
Pressure Rise ◽  
Leading Edge ◽  
Large Area ◽  
Static Pressure Distribution ◽  
Flow Adjustment ◽  
Separation Zones ◽  
Vane Diffuser

The results of experimental studies on performance and wall static pressure distribution in the diffuser passage of a low specific speed centrifugal compressor are given. The performance tests were carried out with vaneless, vane and low-solidity vane diffusers at speeds of 2500, 3000 and 3500r/min. Diffuser wall static pressures measured at 3000r/min for four flow coefficients on the shroud and hub walls are reported. The peak energy coefficient is maximum for the vane diffuser. The operating range of the low-solidity vane diffuser is wider than that of the vane diffuser. At high flow coefficients, the static pressure rise is substantially lower for the vane diffuser, as the incidence on the vane leading edge is very high. The low-solidity vane diffuser did not suffer a large drop in static pressure near the leading edge. The most probable reason may be the large area available in the low-solidity vane diffuser for flow adjustment and weaker flow separation zones on account of the lower number of vanes.

Development of a Very High Pressure Ratio Single Stage Centrifugal Compressor

2015 ◽  
Vol 8 (3) ◽  
pp. 347
Author(s):  
Valeriu Dragan ◽  
Ion Malael ◽  
Bogdan Gherman
Keyword(s):  
High Pressure ◽  
Centrifugal Compressor ◽  
Pressure Ratio ◽  
Single Stage ◽  
High Pressure Ratio ◽  
Very High

Effect of Double Row Diffusers on Performance of a Centrifugal Compressor

2008 ◽  
Author(s):  
P. Banugade ◽  
N. Sitaram
Keyword(s):  
Centrifugal Compressor ◽  
Double Row

Reducing Gas Flaring by Improving Turndown Ratio of Centrifugal Compressor

2011 ◽  
Author(s):  
Falah Mutiaz Al-Azmi ◽  
Chirag Ashwinkumar Parikh
Keyword(s):  
Centrifugal Compressor ◽  
Gas Flaring ◽  
Reducing Gas
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