Experimental Investigation on Off-Design Characteristics of R290 Rolling Piston Compressor

2021 ◽  
Author(s):  
Yuande Dai ◽  
Jiantao Qiu ◽  
Xiangtao Han
Keyword(s):  
Experimental Investigation ◽  
Piston Compressor ◽  
Design Characteristics ◽  
Rolling Piston

A Simulation Study on Translational Piston Air Compressor

2011 ◽  
Vol 328-330 ◽  
pp. 628-632
Author(s):  
Kui Hua Geng ◽  
Meng Tang ◽  
Hong Dong Yu ◽  
Ai Nong Geng ◽  
Shi Guang Du
Keyword(s):  
Simulation Study ◽  
Relative Velocity ◽  
Friction And Wear ◽  
Kinetic Characteristic ◽  
Translational Motion ◽  
Piston Compressor ◽  
Working Principle ◽  
Rolling Piston ◽  
Rotary Speed ◽  
Conventional Rolling

The structure and working principle of a new translational piston compressor was introduced in this paper. Its piston works in a way of translational motion, hence reduces the piston’s relative velocity to cylinder and cap, as well as friction and wear. In order to avoid vane detaching from piston, simulations were carried out regarding the pre-tightening spring and an optimal preload of the spring was obtained. By analyzed and compared to conventional rolling piston compressor in term of contact force between vane and piston, it was pointed out that the new compressor possessed advantage of kinetic characteristic and is more suitable for the situation of high rotary speed.

Experimental investigation on a two-stage CO2 compressor with high back pressure

2011 ◽  
Vol 226 (7) ◽  
pp. 1811-1820
Author(s):  
Zhaogang Qi ◽  
Jun Yang ◽  
Jiangping Chen ◽  
Haifeng Zhang ◽  
Li Zhang
Keyword(s):  
Compression Ratio ◽  
Piston Compressor ◽  
Back Pressure ◽  
Volumetric Efficiency ◽  
Mean Deviation ◽  
Two Stage ◽  
Second Stage ◽  
Two Samples ◽  
Rolling Piston ◽  
Discharge Pressure

In this article, two samples of two-stage rolling piston CO2 compressors with and without intercooler are developed and experimentally studied. These CO2 compressors are high back-pressure compressors, which mean the pressure inside compressor shell is the discharge pressure of the second stage. A test rig was designed to measure the performance and efficiency of this compressor. The test results show that the suction vapor temperature at the second stage inlet pipe has few influences on the performance and efficiency of the first compressor sample with intercooler. The volumetric efficiency linearly decreases with the increase of compression ratio of the suction and discharge pressure, and the volumetric efficiency can maintain in a relative constant range during a wide compression ratio changes in this high back-pressure design. There exists an optimum compression ratio for each suction pressure at the first stage, where the compressor isentropic efficiency is maximum. A generalized volumetric efficiency correlation for two-stage CO2 rolling piston compressor as a function of compression ratio is proposed and it can describe 100% of the test data within ±5.0% with a mean deviation of 1.7%. This would be helpful as a guide for designing such type compressor.

An effective experimental method for identifying radiated noise of different angular ranges for the rolling-piston compressor

2008 ◽  
Vol 222 (12) ◽  
pp. 2409-2417 ◽  
Author(s):  
Z Huang ◽  
W Jiang ◽  
H Zhang ◽  
C Liu ◽  
H Jin ◽  
...  
Keyword(s):  
Experimental Method ◽  
Noise Level ◽  
Angular Position ◽  
Piston Compressor ◽  
Low Noise ◽  
Discharge Process ◽  
Transform Method ◽  
Starting Position ◽  
Rolling Piston ◽  
Low Noise Design

In the traditional analysis method of noise signals, it is very difficult to relate the overall noise from compressors to the angular position. The experimental method of separating the overall noise of different angular ranges is carried out at the real conditions. The starting position of the rotary piston is labelled with vane displacement and the test signals are synchronously sampled. Experimental results are analysed through fast Fourier transform method based on different angular ranges, which displays the following useful conclusions. The experiment technology could effectively identify the angular ranges for the frequency bands with prominent noise level; for the experimental rolling-piston compressor, the vibration, and sound pressure level of the discharge process (210–360 angular degrees) are the largest above the frequency 500 Hz. The discharge process is divided into three parts, where the final part contributes a little to the overall noise level when compared with the other two stages. Pressure pulsation is an important source of vibration and noise and its suppression of peak frequencies is the key of low-noise design of the compressor.

scholarly journals Transient 3D CFD Simulation of a Stationary Vane, Oil Free, Rotary Compressor

2019 ◽  
Vol 63 (4) ◽  
pp. 308-318 ◽  
Author(s):  
Balázs Farkas ◽  
Jenő Miklós Suda
Keyword(s):  
Cfd Simulation ◽  
Piston Compressor ◽  
Working Fluid ◽  
Rotary Compressor ◽  
Heat Sources ◽  
Cfd Model ◽  
Cfd Simulations ◽  
Computational Fluid Dynamics Cfd ◽  
Rolling Piston ◽  
Good Agreement

The evaluation of a newly designed oil-free rotary compressor is presented based on transient 3D Computational Fluid Dynamics (CFD) simulations. The simulations are performed at low compression ratios and low pressure ratios and low rotational speeds. To place the results into context, the data presented in related literature was processed and summarized. The methods related to the CFD model of the newly designed compressor were developed, summarized and evaluated. The accessed CFD data are in good agreement with the results of the former rolling piston compressor related investigations. The oil free operation prevents the contamination of the working fluid from lubricant. Since the compressor is planned to work in open cycle within the sensitive environment of thermal heat sources contamination free operation has to be accomplished. However, oil-free operation also results in significantly lower performance based on the modelling results.

Application of morphed non-linear phase oscillators for representing rolling piston compressor performance

2019 ◽  
Vol 234 (3) ◽  
pp. 332-341
Author(s):  
Balázs Farkas ◽  
Jenö Miklós Suda
Keyword(s):  
Thermal Stresses ◽  
Pressure Fluctuations ◽  
Piston Compressor ◽  
Van Der Pol Oscillator ◽  
Phase Oscillators ◽  
Non Linear ◽  
Complex Models ◽  
Rolling Piston ◽  
Definition Of ◽  
Incremental Learning Method

Rolling piston compressors are small capacity volumetric machines used mainly in household refrigerator and heat-pump units. One of the main characteristics of the compressor is the way how the pressure builds up within the cylinder. This information can be used in more complex models for further investigations, e.g. to analyse the mechanical and thermal stresses of the compressor components. Modelling methods to resemble the pressurisation process of the rolling piston compressor with non-linear oscillators is presented in this paper. The mathematical description of the non-linear oscillators can be used to produce a continuous signal resembling the pressure fluctuations within the cylinder. For the definition of the necessary functions, the main characteristics of the typical rolling piston pressurisation diagram were identified. At first the pressurisation process was approximated by using the mathematical formula of the common Van der Pol oscillator. The oscillator was modified and extended with a linear second order differential equation to improve the resemblance between the target and model functions. To achieve better agreement with the target diagrams, Morphed non-linear oscillators were established. Polynomial and constructive incremental learning method was used to achieve adequate data fitting and the results of both methods were compared. The results show acceptable conformity and proved to be adequate to provide input data for further investigations i.e. for parametric studies of the compressor design. Besides modelling rolling piston compressors, this method can be applied for other volumetric compressors with cyclic pressurization sequence.

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