双向流新风空调气动性能研究及应用

Research and application of the aerodynamic performance of bidirectional flow fresh air conditioning system

为了提升室内空气交换效率,以空调双向流新风系统为研究对象,对其模块内部及其与整机装配结构、气流压损特性分布等展开研究分析,确认优化方向。采用数值模拟与全因子试验寻优,分析了通风腔进气壁面主流方向突扩/渐扩的不同扩压比例分配,锥形、圆弧形与S形导流片型线及其安装位置,传统单通道进气通过设置分流改为双通道进气样式,以及在排风通道内采用设置导流格栅等整流结构的方法,提升吸排新风模式下风机系统的气动性能;最终基于风量台与半消音噪声室等试验设备,验证数值模拟结果的正确性。结果表明,优化后双通道通风腔方案较原有单通道方案在噪声相当的基础上,吸风新风量增加11.8%,排风风量增加9.4%,噪声降低3%。研究结果可为双向流新风领域研究提供一定实际应用价值及现实指导意义。

In order to improve the efficiency of indoor air exchange,the bidirectional fresh air system of air conditioner was taken as the research object,and the interior of its module and its assembly structure with the whole machine as well as the distribution of air pressure loss characteristics were studied and analyzed and the optimization direction was confirmed.By adopting numerical simulation and full factorial experiment optimization,the different pressure distribution ratios of sudden/gradual expansion in the mainstream direction of the intake wall of the ventilation cavity,as well as the conical,arc-shaped,and S-shaped guide lines and their installation positions were analyzed,the traditional single channel intake was changed to a dual channel intake style by setting a shunt,and the rectifier structure such as setting the guide grille was adopted in the exhaust air channel to improve the aerodynamic performance of the fan system in the suction and exhaust fresh air mode.Finally,the correctness of the numerical simulation results was verified based on the test equipment of small air volume table and semi-anechoic noise chamber.The test results show that compared with the original single-channel ventilation scheme,the optimized two-channel ventilation scheme can increase the intake volume of fresh air by 11.8%on the basis of the same noise.Fresh air volume is increased by 9.4%,and the noise is reduced by 3%.The research results can provide certain practical application value and practical guidance for the research of bidirectional flow fresh air field.