论文部分内容阅读
基于雷诺时均方程和Realizable k-ε湍流模型,采用数值计算方法模拟了带后导叶OB-84型轴流风机在变工况下单叶片安装角偏离对风机内流场特征和运行性能的影响.结果表明:随异常叶片安装角偏离度Δβ增大,全压和效率总体呈降低趋势,异常叶片反向偏离时对运行性能的影响总体小于正向偏离情形;安装角偏离将引起风机流场总压和噪声分布的畸变,随Δβ增大,其影响区由周向相邻流道的低压区和高噪区扩展至包括周向下游多个流道的低压带和高噪带;随流量增加,不同Δβ下异常叶片的影响呈现明显不同的特征.
Based on the Reynolds averaged equations and the Realizable k-ε turbulence model, the numerical simulation method was used to simulate the characteristics and operating performance of the OB-84 axial-flow fan with rear vanes deviating from the mounting angle of the single vane under different operating conditions The results show that the total pressure and the efficiency decrease with the increase of the deviating angle Δβ of the abnormal blade mounting angle, and the impact on the running performance when the abnormal blade reverse deviate is less than that of the positive deviation. The deviation of the mounting angle will cause the fan flow With the increase of Δβ, the distortion of the field total pressure and the noise distribution expands to the low pressure zone and the high noise zone including the multiple downstream runners from the low pressure zone and the high noise zone of the circumferentially adjacent runner. With the increase of the flow rate , The effect of abnormal leaf under different Δβ showed obviously different characteristics.