关键词: 风旋增压器, 工作特性, 计算流体力学, 超弹性, 电活性聚合物, 非线性, 模型

Abstract: According to the special structure of the whirlwind supercharger, its solution domain is analyzed and defined firstly, and then meshed by both structured and unstructured grids. The computational fluid dynamics (CFD) code solves 3D Reynolds-averaged Navier-Stokes equations in rotating and stationary coordinate systems with mixing plane method, and turbulence effects are modeled by using a Realizable k-ε turbulence model. The operating characteristics are analyzed on the basis of the results of CFD under the operating conditions of which the whirlwind supercharger operates at a different rotary speed with the same outlet static pressure of the cooling fan and at the same rotary speed with a different fan outlet static pressure. Results of this study indicate that the whirlwind supercharger can provide high supercharging pressure with the increase of rotary speed while the performance of the cooling fan is not affected, and when the outlet static pressure of cooling fan increases, the outlet pressure of compressor also increases. As such, when the engine operates under high load condition, the supercharging pressure can be raised by fully utilizing the outlet back pressure of cooling fan, so as to meet the requirement of the engine, so the whirlwind supercharger has high practical value.

Key words: Computational fluid dynamics, Whirlwind supercharger, Working characteristic, Electroactive polymer, Hyperelastic, Model, Nonlinear