旋回空気をともなうポペット吸気弁の流量係数について

概要

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An intake valve flow discharge coefficient was investigated in the case of air swirling around the valve, as seen in the helical-type intake port of an IC engine. A cylindrical intake port, poppet intake valve of enlarged model and suction tank were constructed to be coaxial, and a honeycomb swirler was installed at the port entrance and rotated around the valve shaft at high speed. The valve angle was 30 degrees, and pressure distributions on the valve and valve seat surfaces were measured. The discharge coefficients were determined by changing the swirler speed and valve lift. Theoretical air flow was induced by taking account of swirling air. The effect of swirl intensity on the discharge coefficient becomes more significant at higher valve lifts, i. e. , the higher swirl the lower the coefficient. At lower valve lift, the swirl effect is more suppressed.
一般社団法人日本機械学会の論文
1994-04-25