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为厘米级微型燃气轮机设计了一台直径为26 mm,设计转速为240 000 r/min,设计流量为30 g/s的微型离心压气机,并在壁面绝热条件和壁面等温传热两种条件下,运用CFX软件进行了数值模拟.结果表明,在同样的轴输入功的情况下,壁面等温传热条件下流量比绝热条件减小7.53%,总对总等熵效率降低约18.1%,总压比减小21.7%.在此基础上,考虑热传导对微型离心压气机进行了改进设计,CFX软件分析结果表明,改进后的设计满足微型燃机总体设计要求.
A miniature centrifugal compressor with a diameter of 26 mm, a design speed of 240 000 r / min and a design flow rate of 30 g / s was designed for a centimeter-level microturbine. Under the conditions of wall adiabatic conditions and wall isothermal heat transfer , And the numerical simulations with CFX software were carried out.The results show that the flow rate under the condition of isothermal heat transfer decreases by 7.53% and the total entropy efficiency decreases by about 18.1% The ratio is reduced by 21.7% .At the same time, the heat transfer is considered to improve the design of miniature centrifugal compressor, the result of CFX software analysis shows that the improved design meets the overall design requirements of micro-combustion engine.