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Roots blower performance optimization and numerical study of flow field

Author: ZhangGuZhong
Tutor: WangFaZhan
School: Xi'an University of Architecture and Technology
Course: Mechanical and Electronic Engineering
Keywords: Roots Blower Numerical Simulation Rotor Counterflow cooling Diverging gap Aerodynamic noise
CLC: TH444
Type: Master's thesis
Year: 2011
Downloads: 63
Quote: 0
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Abstract


Roots blower is a very wide field of application of the national economy is an important industrial equipment. With the rapid economic development, the market's increasing demand for Roots blower, but also on the performance of the Roots blower put forward higher requirements, so study how to further improve the performance of Roots Blower Roots Blower for promoting the development of and broaden its field of application has a very important significance. To further improve the performance of Roots Blower Roots Blower and in-depth understanding of the actual situation of the internal flow, the paper address the problem, which must be discussed and analyzed, summed up some of the analytical methods and practical conclusions, the findings to improve the Roots blower volumetric efficiency, reduce noise and reduce blower blower exhaust temperature has a certain reference value. The main contents of this thesis are: Roots Blower Rotor and chassis structural design; Roots blower flow fluctuation analysis; Roots blower flow field numerical analysis methods; Rotor impact on the Roots blower performance research; diverging gap blower flow field numerical analysis; counterflow cooling blower performance analysis. The main results of this paper are as follows: 1. FLUENT CFD software as a tool by using the RNG k-ε turbulence model and the PISO algorithm, the blower air flow field inside a compressible unsteady flow numerical simulation, numerical simulation and comparative results verify the theoretical analysis discussed in this paper numerical analysis method has good accuracy and reliability. The results showed that: fan-based dynamic mesh flow field numerical simulation of the dynamics that can truly reflect the turbulent flow inside the fan flow field distribution and airflow characteristics of pulsation law, this method can be internal blower airflow characteristics analysis provides a valuable reference. (2) In order to investigate the rotor profile for Roots blower performance, select the same design parameters trefoil arc and involute line blower rotor as the research object, using theoretical analysis and numerical analysis of a combination method, comparative analysis of the two rotor profile their advantages and disadvantages. The results showed that: Rotor for Roots blower performance plays an important role, arc Rotor tip sealing performance is poor, an area of ??low utilization factor, theoretical flow and volumetric efficiency as involute rotor profile, but it does have the advantage of low noise. 3 Use the FLUENT software diverging gap with pre-inlet blower cabinet interior flow field unsteady compressible flow numerical simulation, which truly reflect the diverging gap with pre-inlet casing Roots blower internal turbulent flow pulsating flow field distribution and airflow characteristics of the law. The results show that: the diverging gap structure optimization design of this case can indeed weaken or even avoid the high pressure gas exhaust port back sharply reduce the exhaust gas during dynamic noise. 4 countercurrent cooling techniques in order to study the performance impact on the Roots blower, using theoretical analysis and numerical analysis of a combination of methods to analyze the characteristics of counterflow cooling blower. Numerical analysis is based on FLUENT software, using dynamic mesh method clover arc linear counterflow cooling blower internal flow field of unsteady compressible flow simulation. The results showed that: counterflow cooling technology to improve the performance of the Roots blower played an important role, it can not only reduce the temperature of the exhaust blower, to enhance the pressure of the exhaust blower, and can weaken or even avoid the exhaust port pressure gas reflux dramatically reduce the exhaust gas during the dynamic noise.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Gas compression and transportation machinery > Blower > Rotary
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