This article was written based on the topic of student's dissertation. This is the research of shock phenomena which may occur, under certain conditions, by operation of displacement compressors with the Built-in pressure ratio. These phenomena are called the Shock compression and the Shock expansion or we can use terms "Under-compression" and "Over-compression". The contribution describes current possibilities of a measurement Shock compression at the experimental measuring stand in Laboratory of displacement compressors which is owned by Department of Power Engineering, Faculty of Mechanical Engineering and VŠB -Technical University of Ostrava. The contribution deals with the analysis of the experiment and as well as the results obtained which confirm some the conclusions of the Basic physical model. Keywords Shock Compression, Under-Compression, Screw compressors, Build-in Pressure Ratio Klíčová slovaRázová komprese, Šroubové kompresory, Vestavěný tlakový poměr AbstraktTento příspěvek vznikl na základě tématu disertační práce studenta. Jedná se o výzkum rázových jevů, ke kterým může, za určitých podmínek, docházet při provozu objemových kompresorů s vestavěným kompresním poměrem. Tyto jevy se nazývají rázová komprese a rázová expanze. Příspěvek popisuje současné možnosti měření rázové komprese na experimentálním měřicím standu v Laboratoři objemových kompresorů, jež spadá pod Katedru energetiky, Fakulty strojní, Vysoké školy báňské -Technické univerzity Ostrava. Příspěvek se věnuje rozboru experimentu a také získaných výsledků, které potvrzují některé závěry základního fyzikálního modelu. Klíčová slovaRázová komprese, Šroubové kompresory, Vestavěný tlakový poměr
Shock compression and expansion are phenomena which occur mainly in screw or vane compressors. They occur when there is an imbalance in the built-in and total pressure ratio. These are phenomena that have a negative impact on the operation of these machines and, in general, cause instability in operation, an increase in energy consumption and an overall worsening of the operational economy. The aim of this article is to present newly discovered information regarding making work processes of said compressors more effective, as in many cases, shock phenomena are subconsciously underestimated. The set aim was reached by creating an ideal simulation of isothermal compression of an ideal gas with the implementation of shock phenomena, which were performed on a screw compressor with the operating pressure 7 bar and a flow performance of 3 440 l min−1. Based on the simulations performed, the hypotheses which set forth that the impact of shock phenomena ultimately leads to a sudden increase in compressor power consumption were confirmed. E.g. at 6 bar, the instantaneous power consumption increases by about 5.74% during shock compression and by about 55.95% during shock expansion. This paper deals with new insights and at the same time presents the follow-up research.
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