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  • 王昌庆,黄立,郭立君,浦卫华,赵伟,刘广才.喷射背压对喷油特性影响的仿真及试验研究[J].柴油机,2019,41(3):5-10.    [点击复制]
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喷射背压对喷油特性影响的仿真及试验研究
王昌庆,黄立,郭立君,浦卫华,赵伟,刘广才
0
七一一研究所,上海 201108
摘要:以某型大功率船用柴油机机械式燃油系统为研究对象,基于AMESim软件建立系统一维计算模型,研究恒定及动态背压对喷油特性的影响。仿真结果表明:随喷射背压升高,循环油量呈线性趋势下降;喷油持续期呈抛物线趋势上升。将柴油机台架试验测得的燃油喷射段缸压曲线作为计算边界输入,得到计算循环油量。相比3.0 MPa恒定背压时,循环油量下降了4.9%;喷油持续期延长3.1 °CA。针对该套燃油喷射系统的试验表明:恒定背压设定值由从6.0 MPa升高至10.0 MPa时, 推进25%负荷时主要喷射性能参数对喷射背压变化的敏感性要比推进100%负荷更强。100%负荷,背压为6.0~9.0 MPa时,循环油量变化不大;背压为10.0 MPa时,循环油量下降7.0 mg。而25%负荷时,背压为7.0~10.0 MPa时,背压每上升1.0 MPa,循环油量约下降6.0~8.0 mg。
关键词:  船用柴油机  机械单体泵燃油系统  喷射背压  喷射特性
Simulation and Experimental Study of the Influence ofInjection Back Pressure on Injection Characteristics
Wang Changqing,Huang Li,Guo Lijun,Pu Weihua,Zhao Wei,Liu Guangcai;
Shanghai Marine Diesel Engine Research Institute,Shanghai 201108
Abstract:The mechanical fuel system of a large marine diesel engine was studied, its 1D simulation model was built based on AMESim software. The effects of constant and dynamic back pressure on fuel injection performance were studied. The simulation results indicate that with the increasing of injection back pressure, the circulating fuel quantity decreases in linear trend, however, the injection duration prolongs in parabolic trend. The cylinder pressure curve during fuel injection measured in bench test was input as calculation boundary to get calculated circulating fuel volume. Compared with the constant pressure setting of 3.0 MPa, the circulation fuel quantity was decreased by 4.9%, the injection duration was extended by 3.1 °CA. The test on this type of fuel injection system shows that when the set value of constant back pressure increases from 6.0 MPa to 10.0 MPa, the main injection performance parameters is more sensitive to the change of injection back pressure at 25% propulsion load than at 100% load. At 100% load, when the back pressure is 6.0~9.0 MPa, the circulating fuel quantity changes little; when the back pressure is 10.0 MPa, the circulating fuel quantity decreases by 7.0 mg. At 25% load, when the back pressure is 7.0~10.0 MPa, the circulating fuel quantity decreases 6.0~8.0 mg for each 1.0 MPa increasing.
Key words:  marine diesel engine  mechanical unit pump fuel injection system  injection back pressure  injection characteristics