摘 要:为了获得三叶渐开线罗茨风机基圆半径变化对风机性能的影响关系,首#br# 先从几何原理角度,分析了渐开线基圆变化对风机转子啮合渐开线的影响,给出了符合啮合#br# 条件的渐开线基圆半径变化范围,及不同基圆半径对转子面积利用率系数的影响情况。在此#br# 基础上利用数值分析方法,对同种叶型不同基圆半径时的风机转子流场进行数值计算,运用#br# 动网格技术分析了风机内部的压力场、涡的强度变化和进气口质量流量变化情况。模拟结果#br# 表明:同种叶型渐开线基圆半径增加,能够削弱涡的强度和速度,增加进气口质量流量,提#br# 高风机效率,因此风机生产企业设计时应选择较大的渐开线基圆半径。#br# 关 键 词:数值分析;三叶罗茨风机;渐开线;动网格;基圆半径
Abstract: In order to obtain the relationship between the changes of base circle radius on#br# three-lobe Roots blower and the blower performance, first the influence of blower rotor involutes#br# from the changes of base circle radius is analyzed from the perspective of geometric principles,#br# and the available range of involute base circle radius is given as well as its influence of area#br# utilization factor. Then based on the numerical analysis method, the blower internal pressure field,#br# the vortex intensity variation and the inlet mass flow rate changes under the same rotor type and#br# different base circle radius are calculated by the dynamic mesh technique. Simulation results show#br# that: the increase of the same kind of rotor type involute base circle radius can weaken the vortex#br# strength and speed, increase inlet mass flow, and improve efficiency of the Roots blower. The#br# blower manufacturer should therefore choose a larger involute base circle radius.#br# Key words: numerical analysis; three-lobe Roots blower; involute; dynamic mesh; base#br# circle radius
摘要: 为了获得三叶渐开线罗茨风机基圆半径变化对风机性能的影响关系,首
先从几何原理角度,分析了渐开线基圆变化对风机转子啮合渐开线的影响,给出了符合啮合
条件的渐开线基圆半径变化范围,及不同基圆半径对转子面积利用率系数的影响情况。在此
基础上利用数值分析方法,对同种叶型不同基圆半径时的风机转子流场进行数值计算,运用
动网格技术分析了风机内部的压力场、涡的强度变化和进气口质量流量变化情况。模拟结果
表明:同种叶型渐开线基圆半径增加,能够削弱涡的强度和速度,增加进气口质量流量,提
高风机效率,因此风机生产企业设计时应选择较大的渐开线基圆半径。