Analysis and development of the oil separator of the crank-case ventilation system of a highly-boosted diesel engine

Current problems, related to the development of the crankcase ventilation system for high-powered diesel engines, are considered. To avoid the occurrence of significant excess pressure in the crankcase, which negatively affects the tightness of the seals in engine, the crankcase gases are evacuated to the atmosphere. The main processes that take place in the ventilation system of the crankcase of the diesel engine are singled out and described, as well as the problems and ways of their solution. Information on the advantages and disadvantages of open and closed crankcase ventilation systems is presented. Considerable attention is paid to the main element of the crankcase ventilation system of any engine - oil separator. There is information on the analysis of existing crankcase ventilation systems and oil separators. The evaluation of the efficiency of the crankcase ventilation system is considered. There are criteria for: estimating the flow of oil directly into the crankcase ventilation system; relative oil content in crankcase gases; efficiency of the crankcase ventilation system. The installation for carrying out benchless motorless testing of open and closed crankcase ventilation systems is presented, the technique is described in detail on the results of tests of the patented pilot oil separator by specialists of STC PJSC «KAMAZ». There are data on motor tests of the open crankcase ventilation system with the patented oil separator of the modern diesel engine 8ChN 12/13. Experimental benchless motorless and motor studies confirmed the high efficiency of the crankcase ventilation system with an oil separator. It is established that as a result of bench motor tests of an open crankcase ventilation system with the use of an experimental oil separator, the limit of efficiency with the least efficiency (not lower than 97,5 %) is determined by the values of the consumption of crankcase gases 360 l/min.