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重型废气涡轮增压柴油机用涡轮增压器的总效率比轿车用小型增压器的高。由于进气歧管压力比废气压力高,所以其废气再循环困难。IHI公司为重型柴油机中的废气再循环研制了一种新型涡轮增压器,其压气机侧有一个再循环通道与在增压器进口处的狭窄环形切槽连接,此处的静压力比进气歧管处的低。装用此涡轮增压器的JIS柴油机的13工况试验结果表明:无需明显牺牲燃油耗就能降低26%的NO_x排放量。
The total efficiency of a turbocharger for heavy-duty exhaust turbocharged diesel engines is higher than for a small turbocharger for cars. Because the intake manifold pressure is higher than the exhaust pressure, exhaust gas recirculation is difficult. IHI has developed a new turbocharger for exhaust gas recirculation in heavy duty diesel engines with a recirculation passage on the compressor side connected to a narrow annular groove at the inlet of the supercharger where the static pressure ratio Low at the gas manifold. The 13-duty test of JIS diesel engine equipped with this turbocharger shows that it can reduce NOx emissions by 26% without significantly sacrificing fuel consumption.