汽车专业毕业设计 翻译 中英文全quasiturbine future trends in automobile engine.docx

1、汽车专业毕业设计 翻译 中英文全quasiturbine future trends in automobile engineThis document is available at Seminar ReportQuasiturbine Future Trends in Automobile Engine ByPRADHAN KALPESH HEMANT (B.E MECHANICAL)N.D.M.V.P.S.s COLLEGE OF ENGINEERINGGANGAPUR ROAD, NASIK - 422013 INDIAkalp_pr13 kalpeshpradhanJanuary 2

2、006ABSTRACTThe inventors have made a systematic analysis of engine concepts, their value, their weaknesses, and their potential for improvement. All improvement ideas converged when they suggested making a turbo-shaft turbine having only one turbine in one plane. In order to achieve that, the invent

3、ors had to attach the turbine blades one to another in a chain like configuration, where the rotor acts as compressor for a quarter of a turn, and as engine the next quarter of a turn. This is the Quasiturbine! Many researches are going on to increase energy efficiency on the long term with piston,

4、hydrogen, fuel cell. Hybrid concepts are ways to harvest part of the low power efficiency penalty of the piston engine used in vehicle, but counter-productive measures limit the long term perspective until they could efficiently fuel from the electrical grid. None of these solutions are short term s

5、table and competitive.The Quasiturbine in Beau de Rocha (Otto) cycle is a relatively simple technology which could be widely used within a few years with substantial efficiency benefits over piston engines in many applications. Large utility plants convert energy more efficiently than small distribu

6、ted units and should be favored when possible, but on the long term, the Quasiturbine detonation engine (AC model with carriages) is one of the very few means to match utility efficiency the distributed way, while being as chemically clean as possible.By opposition to dozens of new engine designs, t

7、he most important at this time about the Quasiturbine is the fact that it does unknot a new field of development and offers means to achieve what no other engine design has suggested or is able to, and specially for detonation where piston engine has failed for over 40 years.INDEX What is Quasiturbi

8、ne? How it works? How does it turn? Why is the Quasiturbine Hydrogen Engine superior to conventional IC engine? Advantages of Quasiturbine Applications of Quasiturbine Conclusion References What is Quasiturbine?The Quasiturbine (Qurbine) is a no crankshaft rotary engine having a 4 faces articulated

9、rotor with a free and accessible center, rotating without vibration nor dead time, and producing a strong torque at low RPM under a variety of modes and fuels. The Quasiturbine design can also be used as an air motor, steam engine, gas compressor or pump. The Quasiturbine is also an optimization the

10、ory for extremely compact and efficient engine concepts How it WorksIn the Quasiturbine engine, the four strokes of a typical cycle de Beau de Rochas (Otto) cycle are arranged sequentially around a near oval, unlike the reciprocating motion of a piston engine. In the basic single rotor Quasiturbine

11、engine, an oval housing surrounds a four-sided articulated rotor which turns and moves within the housing. The sides of the rotor seal against the sides of the housing, and the corners of the rotor seal against the inner periphery, dividing it into four chambers. Quasiturbine combustion cycle Intake

12、 (aqua), Compression (fuchsia), Combustion (red), Exhaust (black). A spark plug is located at the top (green) As the rotor turns, its motion and the shape of the housing cause each side of the housing to get closer and farther from the rotor, compressing and expanding the chambers similarly to the s

13、trokes in a reciprocating engine. However, whereas a four stroke piston engine produces one combustion stroke per cylinder for every two revolutions, the chambers of the Quasiturbine rotor generate height combustion strokes per two rotor revolutions; this is eight times more than a four-strokes pist

14、on engine. Because the Quasiturbine has no crankshaft, the internal volume variations do not follow the usual sinusoidal engine movements, which provide very different characteristics from the piston or the Wankel engine. Contrary to the Wankel engine where the crankshaft moves the rotary piston fac

15、e inward and outward, each Quasiturbine rotor face rocks back and forth in reference to the engine radius, but stays at a constant distance from the engine center at all time, producing only pure tangential rotational forces.The four strokes piston has such a long dead time, its average torque is ab

16、out 1/8 of the peak torque, which dictate the robustness of the piston construction. Since the Quasiturbine has not dead time, average torque is only 30% lower than the peak torque, and for this reason, the relative robustness of the Quasiturbine need be only 1/5 of that of the piston, allowing for

17、an additional engine weight saving. Why does it Turn? This diagram show the force vector in a Quasiturbine when one or two opposed chambers are pressurized either by fuel combustion, or by external pressure fluids. Because the pressure vectors are off center, the Quasiturbine rotor experiences a net

18、 rotational force. It is that simple! Quasiturbine as an Imminent SolutionMany researches are going on to increase energy efficiency on the long term with piston, hydrogen, fuel cell. Hybrid concepts are ways to harvest part of the low power efficiency penalty of the piston engine used in vehicle, b

19、ut counter-productive measures limit the long term perspective until they could efficiently fuel from the electrical grid. None of these solutions are short term stable and competitive.The Quasiturbine in Beau de Rocha (Otto) cycle (Model SC without carriages) is a relatively simple technology which

20、 could be widely used within a few years with substantial efficiency benefits over piston engines in many applications. Large utility plants convert energy more efficiently than small distributed units and should be favored when possible, but on the long term, the Quasiturbine detonation engine is o

21、ne of the very few means to match utility efficiency the distributed way, while being as chemically clean as possible. QT-AC (With carriages) is intended for detonation mode,where high surface-to-volume ratio is a factor attenuating the violence of detonation.By opposition to dozens of new engine de

22、signs, the most important at this time about the Quasiturbine is the fact that it does unknot a new field of development and offers means to achieve what no other engine design has suggested or is able to, and specially for detonation where piston engine has failed for over 40 years. Why is the Quas

23、iturbine Hydrogen Engine superior to conventional IC engine?Piston DeficienciesPiston engine deserves respect and should not be arbitrary and globally condemns. However it has deficiencies that no one seems to be willing to list? Here is our list of the main conceptual piston engine deficiencies: Th

24、e 4 engine strokes should not be of equal duration. The piston makes positive torque only 17 % of the time and drag 83 % of the time. The gas flow is not unidirectional, but changes direction with the piston direction. While the piston descents, the ignition thermal wave front has hard time trying t

25、o catch the gas moving in that same direction. The valves open only 20 % of the time, interrupting the flows at intake and at exhaust 80 % of the time. The duration of the piston rest time at top and bottom are without necessity too long. Long top dead center confinement time increase the heat trans

26、fer to the engine block reducing engine efficiency. The non-ability of the piston to produce mechanical energy immediately after the top dead center. The proximity of the intake valve and the exhaust valve prevents a good mixture filling of the chamber and the open overlap lets go some un-burnt mixt

27、ure into the exhaust. The non-ability of the piston to efficiently intakes mixture right after the top dead center. The piston does not stand fuel pre-vaporization, but requires fuel pulverization detrimental to combustion quality and environment. The instantaneous torque impulse is progressive, and

28、 would gain to have a plateau. The components use factor is low, and those components would gain to be multifunctional. The average torque is only 15 % of the peak torque, which imposes a construction robustness for the peak 7 times the average. The flywheel is a serious handicap to accelerations an

29、d to the total engine weight. The connecting rod gives an oblique push component to the piston, which then requires a lubrication of the piston wall. The lubricant is also heat coolant, which requires a cumbersome pan, and imposes low engine angle orientations. The need of complex set of valves, of

30、came shaft and of interactive synchronization devices. The valves inertia being a serious limitation to the engine revolution. The heavy piston engines require some residual compressed gas before top dead center to cushion the piston return. The internal engine accessories (like the came shaft) use

31、a substantial power. The poor homo-kinetic geometry imposes violent accelerations and stops to the piston. Complete reversal of the flows from intake to exhaust. Quite important noise level and vibration. At low load factor, the intake depressurization of the Otto cycle dissipates power from the eng

32、ine (vacuum pump against the atmospheric pressure). Without being pretentious, the fact is that the Quasiturbine corrects or improves each of these deficiencies.Side by SideLike the piston engine, the Quasiturbine is a volume modulator of high intensity, and acts as a positive displacement engine. Here is a di