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Last Updated: 10 June 2022

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Stability of the 7-3 Compressor Circuit for Wallace Tree. Part I

"Summary: In this article, we continue to formalize the concept of the 7-3 Compressor Circuit [11] for Wallace Tree [11], which will define the components of calculation units for a fast multiplication algorithm for VLSI implementation [10]. "We determine the circuit layout of the tree assemblies of the GM Full Adder Circuits. ".

Source link: https://doi.org/10.2478/forma-2020-0005


Early Fault Diagnosis Model Design of Reciprocating Compressor Valve Based on Multiclass Support Vector Machine and Decision Tree

"The basic identifying parameters of gearbox vibration signals are extracted as the fault feature vector training model under various fault conditions, and the samples are tested. " The experimental results show that this method is significantly higher than that of the neural network algorithm in the case of small samples, and that recognition accuracy can be enhanced more than that of the conventional multivariate support vector machine method, which can be more appropriate to reciprocating compressor valve fault diagnosis. ".

Source link: https://doi.org/10.1155/2022/7486271


The effect of friction on crack propagation in the dovetail fixings of compressor discs

"Stress frozen photoelasticity has been used to model dovetail compressor blade fixings. " The stress distribution, the stress intensity factor, and crack propagation direction were determined by Isochromatic and isoclinic data, which were then used to determine the stress distribution, the stress intensity factor, and the crack propagation direction. For two separate dovetail geometries, three coefficients of friction were used. It was discovered that the initial values of the mode II stress intensity factors were higher than that of a lower friction coefficient. An increase in crack length resulted in a proportional decrease in the mode I stress intensity factor and a decrease in the mode II value. Because it influences the relative strengths of the mode I and mode II stress intensity factors, it was concluded that the coefficient of friction influenced crack growth at all stages of crack growth. This has an effect on the direction of the maximum principal stress direction and, in turn, crack propagation. ".

Source link: https://doi.org/10.1243/0954406981521132


Flows and temperatures in compressor and turbine wheelspaces

"This paper sets out principles by which the turbomachine designer can determine the flows and hence the temperatures in the spaces between the rotating and stationary surfaces beneath, or inside, the conventional annular flow zone of axial flow machines. " The fluid temperatures are determined by a heat balance, as well as an inviscid version of the momentum equation for rotating flows in these spaces and simple Bernoulli principles. Such a simplified review of what, in reality, are highly complicated flow systems necessitates the determination of the flows, particularly coefficients of discharge for the controlling restrictions in the rotating flows.

Source link: https://doi.org/10.1243/0954406991522699


Pressure analysis in a compressor cylinder based on detached eddy simulation and dynamic mesh

"Pressure pulsation is of utmost importance in the design of a refrigerant compressor because it acts as a noise and vibration source. " When the pressure disruptions propagate in the refrigerant gases and effect against the wall, leading to the dramatic rise in the sound pressure level in the cylinder and the noise emanating from compressor shell, the vortex flows arise, according to the study.

Source link: https://doi.org/10.1177/0954406212456470


Experimental research on dynamic response of capacity control system in reciprocating compressor

In this article, the agents acting on the actuator used in a reciprocating capacity control scheme are investigated. The effect of reset spring force on actuators' decline and displacement is more visible than hydraulic pressure, according to the study, but actuator reset speeds slow dramatically as the reset spring force is small. With the decrease in the hydraulic pressure, the maximum downward displacement decreases and the consuming time increases. According to this, dynamic response and operation lifetime must be considered simultaneously during the development of partial stroke press-off inlet valve capacity control systems.

Source link: https://doi.org/10.1177/0954406213485661


A flow field study of the interaction between a centrifugal compressor impeller and two different volutes

"The large volute was primarily caused by increasing the small volute axial length. " Both the whole compressor stage results and the impeller results were found in the aero test facility at Solar Turbines Inc. , there was a good correlation between experimental results and numerical simulation results. At high mass flowrate only, the largest deviation is close to 10% for the compressor stage's performance prediction at a high risk of leakage only.

Source link: https://doi.org/10.1243/09544062jmes1522


Experimental measurement of axial clearance in scroll compressor using eddy current displacement sensor

"This paper introduces a technique for measuring axial clearance in a water-lubricated scroll air compressor using a eddy current displacement sensor. The actual test results show that the eddy current sensor has a high sensitivity and preferred static and dynamic results. The actual axial clearance of the scroll air compressor under a working condition was measured, and the tested results revealed that the axial clearance is higher than that in a refrigeration scroll compressor. In addition, the frequency of signal pulses also reflect the change in rotational speed by analyzing the output voltage signals. ".

Source link: https://doi.org/10.1243/09544062jmes778


Experimental study on P-V diagram and valve displacement of a HC290 rotary compressor

Some findings regarding the discharge process starting angle, dynamic variation of pressure in the cylinder, volumetric accuracy, indicated effectiveness, and loss distribution of the R290 rotary compressor under high efficiency conditions were given relative to the R22 compressor. The R290 compressor's performance was shown below under different operating conditions. Several steps to raise the R290 rotary compressor's energy efficiency were suggested. ".

Source link: https://doi.org/10.1177/0954406214566220


Profile design for the cylinder of a double-acting rotary vane compressor

"Inner wall profile of the cylinder in a rotary vane compressor, which influences vaping velocity, suction volume, friction coefficient, etc. , play a significant role in the compressor's performance. " In this paper, a method for the cylinder profile design is suggested in this paper, according to the association between cylinder profile and vane motion characteristics. And the pressure angles between vane and cylinder and the compressor's working volume with the new profile cylinder are superior to harmonic profile cylinder, which is useful for the reduction of friction energy in compressor operation. The cooling capacity and COP of the test refrigeration cycle with the new combined profile cylinder is higher than the compressor with harmonic profile cylinder, according to Experiments.

Source link: https://doi.org/10.1177/0954406215592923

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions