The Test Study And Numerical Simulation On The Noise Generation Mechanism Of The Powerhouse Of Type 6HHE-VE6 Compressor

Large compressor is used extensively in many industrial fields such as chemical industry, iron and steel factory, petroleum industry etc., owing to its advantages: high adiabatic effectiveness and discharge pressure. It has large volume,high power, and high sound pressure level which can reach 100~130dB(A). The noise severly pollutes the internal and external sound circumstance of the powerhouse and exerts an influence upon the workers'health. It is one of the fundamental tasks to further study the noise generation mechanism of the large compressor powerhouse. Therefore, in this paper, some further investigations on the noise generation mechanism of the powerhouse of compressor are based on 6HHE-VE6 compressor by the method of theoretic analysis, test analysis and numerical simulation. The identification and the location of the noise sources caused by the large compressor are made. The basic conceptions and evaluations of noise are simply reviewed and some principal noise sources of the powerhouse of compressor are analysed by theoretic methods. Then, according to national standard GB/T4980-2003, sound power level and spectrum radiated from type 6HHE-VE6 compressor are measured with INV-303/306 Intelligent Signal-Acquisition and Analyzer by the method of reduced approach . Three-dimensional sound intensity test has been conducted on the surface of the compressor by the method of sound intensity technique, then the sound intensity distribution is given and the identification and the location of the noise sources are made. Numerical simulations on the three-dimentional sound field of the powerhouse have been discussed in this paper. The FEM is used to solve equation of acoustic wave, and the FEM equations of the three-dimentional sound field based on the type of 6HHE-VE6 compressor have been derived. In this paper, the unsymmetrical method is used to solve the three-dimentional sound field FEM equations which have been derived. And the results for the powerhouse: the acoustic natural frequency and the mode of acoustics are obtained. At last, the pattern of the pressure distribution of the sound field response is obtained by the harmonic response analysis. Numerical simulation analysis of the radiated sound field caused by the vibration of pipes has been done in this paper. Considering the fluid-structure, the analysis of the radiated sound field caused by the vibration of pipes of the type 6HHE-VE6 compressor has systematically been completed by the finite element method. In this paper, some influential factors,such as the properties of fluid outside pipe, the amplitude and phase angle of the vibration of the pipes, the number of the pipes and the distance of the pipes etc., are taken into account. And the patterns of the pressure distribution of the sound field have been obtained from the calculation. The measures reducing the noise in the compressor powerhouse have also been discussed in detail in this paper. In order to reduce the noise in the compressor powerhouse, the following aspects are considered : the noises caused by the compressor,by the pipes of the compressor,and by the gas storage of the compressor , and the control of these noises etc.