【作者】 郭晓斌；

【导师】 王孚懋；

【作者基本信息】 山东科技大学 ， 热能工程， 2010， 硕士

【摘要】 罗茨鼓风机因其具有结构简单、工作稳定、无内压缩等优点,广泛应用于气体输送等各个工业部门。然而,罗茨鼓风机在生产中产生的振动与噪声问题十分突出,不仅加剧了设备磨损并降低了安全使用寿命,而且污染环境、影响人身健康,从而限制了应用范围并降低了市场竞争力。本课题基于山东省自然科学基金项目“罗茨鼓风机噪声源识别与预估模型研究”(Y2006F38),着重分析罗茨鼓风机的低噪声模型结构性能与内流气动参数,为结构优化设计奠定理论基础。本文的主要研究内容有：研究了罗茨鼓风机结构与热力学特性,建立了理论流量、内泄漏流量、外泄漏流量、实际流量与容积效率及气流脉动等关键参数的数量关系,分析了参数变化的内在联系。研究了罗茨鼓风机低噪声模型结构参数及气体作用力,并对罗茨鼓风机噪声源进行了分析,研究了噪声控制的主要措施,提出了罗茨鼓风机低噪声结构设计原理。采用AutoCAD建立了罗茨鼓风机渐开线三叶叶轮的型线,并运用SolidWorks软件建立了罗茨鼓风机主要零部件的实体模型,实现了虚拟装配及干涉检查,保证了设计的合理性。利用SolidWorks对罗茨鼓风机内部工作状况进行了动态模拟,分析了内部结构及工作原理。建立了罗茨鼓风机内流数值模拟的二维几何模型及数学模型,采用动边界分布(Profile)实现动网格,运用FLUENT软件研究了不同罗茨鼓风机在不同工况下的内流情况,得出了三叶逆流冷却罗茨鼓风机在降低排气流量脉动及气动噪声方面具有优越性的结论,提出了低噪声罗茨鼓风机的优化设计策略。更多还原

【Abstract】 Roots blowers are applied widely in the department of gas transportation of various industries due to its merits, such as simple, stable and without internal compression. However, it is an outstanding issue that the blowers generate noise and vibration, not only for increasing wear and reducing the service life of equipment, but also for environment pollution and affecting health of human body, thus, the scope of application of blowers is limited and the market competitiveness is reduced. Consequently, based on the project of the Natural Science Foundation of Shandong Province "Research on Roots Blower Noise Source Identification and Prediction Models (Y2006F38)", the low noise structure performance and the parameters of inner flow are studied for the theory foundation of the structural optimization design on blowers. The main contents and contributions in the dissertation are as follows:The structure and thermodynamic properties of Roots blower are analyzed, the quantitative relationship between theoretic flow, internal leakage flow, external leakage flow, actual flow, volumetric efficiency with airflow pulsation is established and the relationship between each parameter is studied.The low noise structural parameters and gas load of Roots blower are researched, the noise source is analyzed, the main measures of noise control are studied, and the low-noise design principle of blower is present.The contour line of Roots blower involute three-lobe impeller is created by AutoCAD; and in order to be a reasonable design, the solid model of Roots blower main components is established and assembled virtually by SolidWorks. Finally, the blower internal working condition is simulated by SolidWorks, for the purpose of making out the internal structure and operation principle.Two-dimensional model and mathematical model of inner flow numerical simulation for blower are established, the dynamic grids are come true by Profile, the advantages of three-lobe countercurrent cooling Roots blower of reducing airflow pulsation and aerodynamic noise are indicated after numerical simulation on different type and different condition by FLUENT, on this basis, the low-noise optimal design strategy is proposed.更多还原