【摘要】 在内燃机整个工作循环中 ,其缸内流体始终进行着极其复杂而又强烈瞬变的湍流运动 ,要正确地分析内燃机的燃烧和排放 ,离不开对缸内湍流运动的正确描述和模拟。通过快速畸变分析对由重整化群理论得到的RNGk -ε湍流模型进行了压缩性修正 ,把经压缩修正后的RNGk -ε湍流模型应用于内燃机缸内湍流流动的数值模拟 ,计算采用任意拉格朗日欧拉法。给出了用RNGk -ε模型计算得到的结果 ,并与标准的k -ε模型算得的结果和实验结果进行了比较。结果表明 ,RNGk -ε湍流模型得到的结果比k -ε模型算得结果的精度有所提高 ,其计算程序编制的难易程度和计算成本与k-ε模型相当 ,此模型适合于计算内燃机缸内湍流流动更多还原

【Abstract】 Fluid flows in whole working loop of combustion engine cylinders are very complicated, with violent transient and turbulent flows existing at entire circle. For this reason, correct simulation and analysis of combustion and discharge of combustion engines need correctly describing and simulating in-cylinder turbulent flows. Under the assumption of rapid distortion, the RNG k-ε turbulence model is modified to include the compressibility effects and applied to in-cylinder turbulent flows of combustion engines. The calculations are based on the arbitrary Lagrangian-Eulerrian method, and the experimental results are compared with the results gotten by normal k-ε model, it shows that the RNG k-ε turbulence model is better than the traditional k-ε model and is suitable to describe combustion engine flows.更多还原