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RISS 인기검색어
- 검색키워드
- 저자 : R. LANZAFAME (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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ICE GROSS HEAT RELEASE STRONGLY INFLUENCED BY SPECIFIC HEAT RATIO VALVES
Lanzafame, R.,Messina, M. The Korean Society of Automotive Engineers 2003 International journal of automotive technology Vol.4 No.3
Several models for the evaluation of Gross Heat Release from the internel combustion engine (ICE) are often used in literature. One of these is the First Law - Single Zone Model (FL-SZM), derived from the First Law of Thermodynamic. This model present a twice advantage: first it describes with accuracy the physic of the phenomenon (charge heat release during the combustion stroke and heat exchange between gas and cylinder wall); second it hat a great simplicity in the mathematical formulation. The evaluation of Heat Release with the FL-SZM is based on pressure experimental measurements inside the cylinder, and ell the assumption of several parameters as the specific heat ratio, wall temperature, polytropic exponent for the motored cycle evaluation, and many others. In this paper the influence of gases thermodynamic properties on Cross Heat Release has been esteemed. In particular the influence of an appropriate equation for k=k(T) (specific heat ratio vs. temperature) which describes the variations of gases thermodynamic properties with the mean temperature inside the cylinder has been evaluated. This equation has been calculated by new V order Logarithmic Polynomials (VoLP), fitting experimental gases properties through the least square methods.
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ICE GROSS HEAT RELEASE STRONGLY INFLUENCED BY SPECIFIC HEAT RATIO VALUES
R. LANZAFAME,M. MESSINA 한국자동차공학회 2003 International journal of automotive technology Vol.4 No.3
Several models for the evaluation of Gross Heat Release from the internel combustion engine (ICE) are<br/> often used in literature. One of these is the First Law - Single Zone model (FL-SZM), derived from the First Law of Thermodynamics. This model presents a twice advantage: first it describes with accuracy the physic of the phenomenon (charge heat release during the combustion stroke and heat exchange between gas and cylinder wall); second it has a great simplicity in the mathematical formulation. The evaluation of Heat Release with the FL-SZM is based on pressure experimental measurements inside the cylinder. and on the assumption of several parameters as the specific heat ratio. wall temperature. polytropic exponent for the motored cycle evaluation. and many others. In this paper the influence of gases thermodynamic properties on Gross Heat Release has been esteemed. In particular the influence of an appropriate equation for k= k(T) (specific heat ratio vs. temperature) which descrihes the variations of gases thermodynamic properties with the mean temperature inside the cylinder has heen evaluated. This equation has been calculated by new V order Logarithmic Polynomials (VoLP). fitting experimental gases properties through the least square methods.
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COMMON RAIL INJECTOR MODIFIED TO ACHIEVE A MODULATION OF THE INJECTION RATE
FICARELLA A.,GIUFFRIDA A.,LANZAFAME R. The Korean Society of Automotive Engineers 2005 International journal of automotive technology Vol.6 No.4
Injection rate shape control is one feature of a diesel fuel injection system that is strongly desired at this time. In the conventional common rail system, it is difficult to control the injection rate since the fuel pressure is constant during the injection period, resulting in a nearly rectangular rate shape. In order to look into possible injection modulations, injectors equipped with standard and geometrically modified control valves were investigated in detail by means of computer modelling and simulation. Experiments were carried out to validate the feasibility of such a shaping. The results of this study show a noteworthy dependence of the fuel rate on geometrical modifications in the piloting stage of the injector.
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COMMON RAIL INJECTOR MODIFIED TO ACHIEVE A MODULATION OF THE INJECTION RATE
A. FICARELLA,A. GIUFFRIDA,R. LANZAFAME 한국자동차공학회 2005 International journal of automotive technology Vol.6 No.4
Injection rate shape control is one feature of a diesel fuel injection system that is strongly desired at this time. In the conventional common rail system, it is difficult to control the injection rate since the fuel pressure is constant during the injection period, resulting in a nearly rectangular rate shape. In order to look into possible injection modulations, injectors equipped with standard and geometrically modified control valves were investigated in detail by means of computer modelling and simulation. Experiments were carried out to validate the feasibility of such a shaping. The results of this study show a noteworthy dependence of the fuel rate on geometrical modifications in the piloting stage of the injector.
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INVESTIGATION OF SHORT INJECTIONS USING STANDARD AND MODIFIED COMMON RAIL INJECTORS
A. FICARELLA,A. GIUFFRIDA,R. LANZAFAME 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.2
The control of the fuel to be introduced into the combustion chamber under idling and low-load conditions is known to be a problem in Diesel engines, owing to the relatively small fraction of the full-load fuel needed under light loads. Thus, particular attention should be paid to the behavior of the injector with reference to short injection events. This work presents the results of an experimental campaign carried out with two different types of common rail injectors, a standard injector and a modified one. The latter, coming from a simple modification realized in a standard injector, exhibits linear behavior between injected fuel and solenoid energizing time in the field of short injections. A direct comparison of the two injection behaviors suggests a possible way to better control short or pilot injections.
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INVESTIGATION OF SHORT INJECTIONS USING STANDARD AND MODIFIED COMMON RAIL INJECTORS
Ficarella, A.,Giuffrida, A.,Lanzafame, R. The Korean Society of Automotive Engineers 2007 International journal of automotive technology Vol.8 No.2
The control of the fuel to be introduced into the combustion chamber under idling and low-load conditions is known to be a problem in Diesel engines, owing to the relatively small fraction of the full-load fuel needed under light loads. Thus, particular attention should be paid to the behavior of the injector with reference to short injection events. This work presents the results of an experimental campaign carried out with two different types of common rail injectors, a standard injector and a modified one. The latter, coming from a simple modification realized in a standard injector, exhibits linear behavior between injected fuel and solenoid energizing time in the field of short injections. A direct comparison of the two injection behaviors suggests a possible way to better control short or pilot injections.
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