Abstract
The performance of the turbocharger can be improved by optimizing the structural parameters of the compressor impeller. In this work, the existing centrifugal compressor impeller was taken as the case study, and the line shape of the hub was modified in order to study the influence of the line curvature of the hub on the compressor performance. Furthermore, the Navier–Strokes flow equation and the fourth-order Runge–Kutta method were used with Numeca software in order to solve the steady-state RANS equation, and the RANS equation is the averaging of unsteady N-S equations on time to solve the engineeringly required averaging. The numerical simulations and the performance predictions were made for each case, and then, the experiments were carried out to verify the accuracy of the aerodynamic performance that was obtained from the numerical simulations. The research results showed that within the design value range, the curvature of the impeller hub profile increased when the flow range and surge margin of the compressor impeller increased. Moreover, the pressure ratio, efficiency, and post-compression temperature increased when the relative Mach number at the inlet of the impeller decreased, the shock wave intensity that was generated by the gas in the flow channel decreased, and the velocity loss decreased. The obtained influence of the compressor impeller hub linearity on the compressor performance provides an opportunity to further improve the performance of the centrifugal compressor.
Highlights
Turbocharger technology is very important for the development of vehicle engines
Malik et al.4–6 added multiple splitter blades to the centrifugal compressor in order to improve the pressure ratio and efficiency. They found that compared with conventional centrifugal impellers, when the large splitter was close to the pressure surface of the main blade and when the small splitter was close to the suction of the main blade, it reduced the flow separation strength and the pressure loss
The pressure conditions of the import and export of the compressor were defined, the pressure ratio was very low, and the compressor was in a choke state
Summary
Turbocharger technology is very important for the development of vehicle engines. The impeller, as the primary component of the centrifugal compressor, has a significant influence on the performance of the entire compressor. Omidi et al. studied the influence of parameters such as the angle of the front and rear edge blades and the starting point of the splitter blade on the performance of the compressor. Malik et al. added multiple splitter blades to the centrifugal compressor in order to improve the pressure ratio and efficiency. Many researchers have conducted a lot of research studies on the geometric parameters and the performance of the compressor impeller, such as the blade shape, backbend angle, and meridian surface. This study uses the simulation calculation and the experimental verification methods to obtain the influence of the compressor impeller hub linearity on the compressor performance under the condition that the position of the splitter blade remains unchanged, which may show higher performance during the compressor design process
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