Wankel Engines Project Report edited .pdf - 123SeminarsOnly

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Fig. 35 A smaller volume of the rotor recess improves fuel consumption and performance at W.O.T., but, at the same time, increases the amount of emission of NO and HC. PROBLEMS INVOLVED IN INCREASED BURNING SPEED (1) KNOCKING The rotor recess of high compression ratio or of squish flow intensified type will raise the working gas pressure in the trailing side of the combustion chamber at heavy-load. As the burning speed is increased, "knocking" is liable to occur. Therefore, the rotor recess must be selected so that the working gas pressure in the trailing side will not be raised more than necessary. Fig. 36 shows the research octane number with the varied compression ratios. Fig. 36 Fig. 37 26
(2) DETERIORATION OF LIGHT-WAD DRIVEABILITY A higher combustion speed improves the thermal efficiency, but reduces the charging efficiency in lightload operation such as idling. The rate of burned gas in the fresh mixture, that is, the rate of inactive gas in the mixture, will increase thus decreasing ignitability. Fig. 37 shows a comparison of the range of fuel flow for stable idling between the LDR and MDR rotors. EFFECT OF GAS SEAL The rotary engines constructed to maintain gas tightness of each working chamber by means of gas seals. Therefore, the gas seals have a great effect on fuel consumption performance, performance at W.O.T. and on exhaust emissions of the engine. Many efforts have been made for their improvement. The gas tightness of the seals has been tremendously improved in comparison with those in the early stage of development of the engine. Such improvement has been brought about mainly by development of sealing material, improvement of seal configuration, use of smaller tolerances in manufacture and development of surface treatment techniques. IMPROVEMENT OF GAS SEAL (1) APEX SEAL For further improvement of sealing performance of the apex seal, it is required to reduce the clearance at the split of the apex seal and that between the apex seal and the housing due to thermal deformation in running condition. Fig. 38 shows the reduced clearance at the apex seal split. Fig. 39 shows the measured clearance caused due to thermal deformation during operation. This clearance can be reduced by crowning the apex seal. Fig. 40 shows the effect of crowning on the mean effective pressure at W.O.T. 1,000 rpm. Fig. 38 Fig. 39 Fig. 40 This clearance can be reduced by crowning the apex seal. It is clear that the optimum selected value for the crowning will improve the gas tightness function. 27
Page 1 and 2: PROJECT REPORT Application of Wanke
Page 3 and 4: IMPROVEMENT OF GAS SEAL ...........
Page 5 and 6: housing and a rotor that is similar
Page 7 and 8: Fig. 3 While a four-stroke piston e
Page 9 and 10: idling, so peripheral ports are ide
Page 11 and 12: DISADVANTAGES OF WANKEL ENGINES The
Page 13 and 14: SEALING The gas sealing mechanism f
Page 15 and 16: Fig. 11 INTAKE AND EXHAUST MECHANIS
Page 17 and 18: Fig. 14 Fig. 15 Therefore, an appro
Page 19 and 20: Fig. 18 Fig. 19 The discharge of th
Page 21 and 22: consumption in an automobile and th
Page 23 and 24: determined to secure sufficient ope
Page 25: Fig. 30 Fig. 31 Fig. 32 The LDR rot
Page 29 and 30: The amount of NO emission is decrea
Page 31 and 32: LOCATION AND NUMBER OF SPARK PLUGS
Page 33 and 34: exhaust gas temperature as high as
Page 35 and 36: port opening time and eliminating o
Page 37 and 38: STRATIFIED CHARGE TYPE ROTARY ENGIN
Page 39 and 40: Also, a multi-rotor engine with mor

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