Abstract:With the rapid development of a high-power scroll compressor (HSC), the dynamic performance of a scroll compressor has an important impact on the vibration and noise of the whole compressor. So, the dynamic characteristics and structural acoustic radiation characteristics of HSC under dynamic excitation are studied by simulation and experiment in this paper. Firstly, the dynamic simulation model of HSC is established to analyze the time-domain and frequency-domain characteristics of bearing excitation and uppe… Show more
“…During the work of the scroll expander, the high temperature and pressure gas exert stress on the scroll, which causes the scroll to elastically deform. 18 As shown in Figure 3, the orbiting scroll is mainly exposed to radial gas force F r , tangential gas force F t , axial gas force F a , tangential torque M t , rotation torque M s , and overturning torque M o 19 .Figure 3.Gas force analysis.…”
Section: Three-dimensional Flow Field Distributionmentioning
For research on the effect of different working loads on the deformation of variable base circle radius scroll expander scroll teeth, a multi-field-coupled calculation method is proposed to reveal the deformation law of scroll teeth under different working loads. In this paper, the equations of the variable base radius profile are derived using the normal isometric method to establish a three-dimensional model of the variable base radius scroll expander. The CFD dynamic mesh technique is used to simulate the working process of a variable base radius scroll expander to obtain the flow field variation in the inner part of the working chamber. The results of the simulation are applied to the scroll teeth by interpolation to analyze the deformation of the scroll under single-field loading and multi-field coupling, to obtain the deformation law of the scroll teeth. The results of the study show that the deformation of the scroll teeth does not decrease linearly with the involute spreading angle from the head to the tail of the teeth due to the uneven temperature distribution of the scroll expander. The thermal stress of the temperature load impacts the deformation trend and amount of the scroll tooth, whereas the gas force load just modifies the amount of scroll tooth deformation and has a lower effect on the scroll tooth's deformation trend. Under different loads, the same deformation and different deformation on the scroll teeth can interact with each other to reduce the scroll tooth deformation to a certain extent.
“…During the work of the scroll expander, the high temperature and pressure gas exert stress on the scroll, which causes the scroll to elastically deform. 18 As shown in Figure 3, the orbiting scroll is mainly exposed to radial gas force F r , tangential gas force F t , axial gas force F a , tangential torque M t , rotation torque M s , and overturning torque M o 19 .Figure 3.Gas force analysis.…”
Section: Three-dimensional Flow Field Distributionmentioning
For research on the effect of different working loads on the deformation of variable base circle radius scroll expander scroll teeth, a multi-field-coupled calculation method is proposed to reveal the deformation law of scroll teeth under different working loads. In this paper, the equations of the variable base radius profile are derived using the normal isometric method to establish a three-dimensional model of the variable base radius scroll expander. The CFD dynamic mesh technique is used to simulate the working process of a variable base radius scroll expander to obtain the flow field variation in the inner part of the working chamber. The results of the simulation are applied to the scroll teeth by interpolation to analyze the deformation of the scroll under single-field loading and multi-field coupling, to obtain the deformation law of the scroll teeth. The results of the study show that the deformation of the scroll teeth does not decrease linearly with the involute spreading angle from the head to the tail of the teeth due to the uneven temperature distribution of the scroll expander. The thermal stress of the temperature load impacts the deformation trend and amount of the scroll tooth, whereas the gas force load just modifies the amount of scroll tooth deformation and has a lower effect on the scroll tooth's deformation trend. Under different loads, the same deformation and different deformation on the scroll teeth can interact with each other to reduce the scroll tooth deformation to a certain extent.
“…Leila [3] et al evaluated the vibration signals of twin-screw refrigeration compressors using CFD software applying flow field pressure loads to a rotor-bearing system based on multi-body dynamics; Li Chao [4] et al analyzed the variation law of the crank force and angular acceleration of the drive bearing of the scroll compressor under different clearances, using the multi-body dynamics theory，and analyzed the transient dynamic response of the rotor under different angular acceleration excitation using the finite element method; Jiang Shijie [5] et al conducted a dynamic experimental study of centrifugal compressor impeller and simulated the impeller based on the vibration signals collected; For the reciprocating compressor pipeline vibration problem, Li Shuxun [6] et al performed pressure pulsation calculation and fluid-solid coupling modal analysis on the pipeline, and the results showed that the vibration was caused by the fluid pressure pulsation frequency and the pipeline mechanical inherent frequency falling within the resonance region of the compressor excitation frequency. Wang [7] et al established a dynamic simulation model of scroll compressor and analyzed its time domain characteristics and frequency domain characteristics under bearing excitation and support excitation, meanwhile, the transient dynamic response of scroll compressor under the action of excitation source was analyzed; Liu Libo [8] et al established a scroll compressor vibration test experimental system and studied the vibration contribution of the main components of scroll compressor to the whole machine, the results showed that the rotor system dynamic balance is the main source of vibration triggering the whole machine, and the vibration contribution ratio of the main bearing position of the drive shaft is the largest. Xu [9] et al simulated the internal flow field, structural vibration and external noise of a centrifugal compressor using finite element techniques, and studied the vibration and noise caused by unsteady flow inside the centrifugal compressor; Yang Fan [10] et al established a fluid-solid coupling model for air conditioning pipeline to obtain the surface pressure on the inner wall of the pipeline under pulsating excitation, meanwhile, the harmonic response analysis of the pipeline system was carried out with compressor vibration and pressure on the inner surface of the pipe as the excitation source, which finally showed that fluid pressure fluctuation has an important influence on the dynamics analysis of the pipeline system.…”
Under the action of the flow field force and the constraint reaction force of the negative rotor and the positive rotor, the twin screw compressor shell will produce vibration, which will affect the life of the parts and produce noise. The rotors restraint reaction force are calculated by fluid-structure coupling method. The shell inherent frequency is solved by modal analysis, and the shell resonance is analyzed during the rotors meshing process. On this basis, the flow field force and rotor constraint reaction force are used as the compressor shell vibration excitation sources, and the vibration response of the compressor shell under the action of excitation force is studied. The research results can provide some reference for the optimized design of compressor shell structure.
“…Tese research objects are essentially air conditioners with traditional structures. However, for new indoor units, the scroll compressor, a crucial component in refrigeration and heat pump systems, stands out as the primary source of noise [7,8]. Te issue of low-frequency noise is of utmost severity.…”
A novel split-type air conditioning system is introduced to balance usability and portability. Unlike conventional split-type systems, where the compressor is typically placed outside, this system situates the compressor within the indoor unit, which may expose users to compressor noise. There are prominent peaks in the compressor noise spectrum, particularly at the compressor operating frequency and its harmonics, notably the second and third harmonics. The research presents a multilayered acoustic enclosure specifically designed for air conditioning compressors to address this issue without modifying the compressor or indoor unit casing. In order to get better sound insulation performance, a response surface methodology (RSM) is applied to optimize the thickness ratio, open area ratio, and open area height of the acoustic enclosure with predefined thickness. In addition, topological optimization is employed to strengthen weak areas of the acoustic enclosure. Then, experimental trials using the proposed acoustic enclosure are conducted in a semianechoic chamber. Results demonstrate significant reductions in noise levels, including 7.99 dB(A), 5.69 dB(A), and 5.19 dB(A) reductions in the fundamental frequency, second harmonic, and third harmonic noise of the compressor’s operating frequency, respectively.
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