Amplitude-Resonance Characteristics and Optimum Operating Modes of Reciprocating Compressors
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COMPRESSORS, PUMPS, AND PIPELINE FITTINGS AMPLITUDE-RESONANCE CHARACTERISTICS AND OPTIMUM OPERATING MODES OF RECIPROCATING COMPRESSORS Yu. A. Rutkovskii,1 A. Yu. Rutkovskii,1 G. K. Lavrenchenko,2 and V. V. Naichuk3
UDC: 622.323:621.5.565.43
An effective means for intensifying the action of reciprocating compressors involves the use of resonant vibration of gas pressure in suction systems. Such systems represent a combination of a suction line, a suction valve and a cylinder serving as variable volume acoustic capacitance. By upgrading the suction system in this way, it is possible to achieve an increase in compressor capacity up to 20% without capital expenditure. The use of resonant oscillations of gas pressure is especially effective in the suction systems of compressors having first-stage double-acting cylinders. An analysis of the amplituderesonance characteristics of a VP-20/8M compressor showed that its maximum performance occurs at two resonance length values of the suction pipeline, corresponding to the resonances of pressure fluctuations in the second harmonic. Two variants of indicator diagrams for compressors operating under such resonance oscillation conditions are considered. The filling of the cylinder with air in the resonance zone continues with the reverse movement of the piston. The super-resonance zone appears to be the most economical in terms of specific power. It is shown that the best characteristics are achieved when using straight-flow valves. Keywords: reciprocating compressor, air, suction, suction system, pressure oscillations, resonance, valves, indicator diagram, amplitude-resonance intensification.
Although gas-dynamic resonance processes in the suction systems of reciprocating compressors are the subject of many scientific studies, the results of such studies have yet to find significant practical application. The reason for this involves an insufficient knowledge of the interrelated processes caused by the formation of resonant acoustic waves, the resistances of the suction valves, as well as thermodynamic phenomena arising during suction and at the moment of closing the valves. In this regard, there is no currently available comprehensive description of the manifestation of various factors affecting the efficiency of applying gas pressure resonant oscillations to increase the output and reducing the specific power requirements of the compressor in a compressor suction system. Some research results on this topic are presented in earlier publications [1–6], which have continuing relevance. Information of potential interest to specialists is presented in more recent articles [7–9]. The results of the research carried out to date chiefly apply to a consideration of the most expedient application of gas pressure resonant oscillations in compressor suction systems employing double-acting cylinders. 1 2 3
Donbass State Technical University, Alchevsk, Ukraine.
Institute of Low-Temperature Energy Technologies LLC, Odessa, Ukraine; e-mail: [email protected]. Novatek LLC, Sumy, Ukr
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