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利用高速摄影研究二甲基醚的喷雾特性 总被引:2,自引:1,他引:2
本文利用高速摄影技术在定容压力室中,通过6孔电磁喷射器,研究了二甲基醚(DME)的喷雾特性。结果表明,二甲基醚的喷雾射程随着定容压力室内气体压力的增加而减少;喷雾锥角则随和的升高而增大,在相同的条件下,二甲基 喷射锥角大于 喷射锥角;喷雾射程则低于柴油的喷雾射程。Hiroyasu喷雾射程的计算模型,通过适当的系数修正可以用于DME喷雾射程预测,由于DME喷雾射程和着火延迟期都比柴油短,在屐机缸内着火时刻,柴油的喷雾射程约为DME的2倍,从高速摄影的喷雾影像中可以清楚的看到,DME的蒸发速度明显比柴油快。 相似文献
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铁路喷漆作业混苯治理措施的研究 总被引:1,自引:0,他引:1
铁路喷漆作业现场及喷漆作业过程中散发在空气中的有机废气[挥发的溶剂(酯、酮、醇类)及稀释剂(煤焦油类、苯、甲苯、二甲苯)]及固体漆雾粒子(树脂、颜染料)。依据国内外各行业喷漆技术发展的动向,找到了解决铁路机务段、车辆段及铁路工厂喷漆作业混苯物污染的控制手段。即:改革工艺采用新技术和新材料,实施上送风下排风空气幕及实施净化措施和加强个体防护的综合治理措施。 相似文献
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对锰铜合金螺旋桨表现热涂涂层的性能进行了试验,并对采用热喷涂涂层防止螺旋桨腐蚀的可行性进行了研究。试验结果表明:采用高速氧燃料喷涂技术形成的Cu95超涂层人有优良的耐空蚀,耐海水腐蚀性能,可作为锰铜系合金螺旋桨表面的防腐涂层。 相似文献
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A piezoelectric atomization device achieves fuel pressure modulation through vibration of a piezoelectric pressure modulator.
As a consequence, the fast alternating and slow moving streams collide with each other and further break up the fuel drop.
In this paper, an experimental investigation was carried out to study the fluid dynamic characteristics of the spray atomization
process of automotive port fuel injectors with a piezoelectric pressure modulator. The investigation mainly focuses on: (a)
the coupling characteristics between the piezoelectric stack and the hydraulic as well as the transfer characteristics of
pressure modulation from the piezoelectric modulator to the point above the orifice; (b) the time history of the pressure
dynamic response at the point above the orifice under a typical modulation frequency, which reflects the variation of pressure
modulation while the fuel injector is working; and (c) the time-variation characteristics related to mechanical structure
and fluid dynamics. The experimental results expose some important dynamic characteristics of pressure modulation, which will
be very significant and lead us to greatly improve the fuel injection system, optimize the control parameters and implement
spray atomization with a high quality performance in the near future. 相似文献
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In this paper, an experimental study on the wall-impinging spray of the slit-type GDI injector is presented. To examine the
effects of various factors on the development of a spray impinging on the wall, experiments were conducted at various injection
pressures, ambient pressures, wall distances from the injector tip, wall temperatures, and wall inclination angles. Behavior
of the impinging spray was visualized using a planar laser scattering method. It is shown that the spray path penetration
of the wall-impinging spray increases with increases in injection pressure, wall distance, wall temperature, or wall angle.
On the other hand, the spray path penetration of the wall-impinging spray decreases with increases in ambient pressure. The
predicted spray path penetration calculated by the empirical equation estimates the spray path penetration in all cases, and
the empirical equation is optimized for the total injection pressure. 相似文献
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S. Kim J. M. Nouri Y. Yan C. Arcoumanis 《International Journal of Automotive Technology》2009,10(3):277-284
The spray characteristics of a 6-hole injector were examined in a single cylinder optical direct injection spark ignition
engine. The effects of injection timing, in-cylinder charge motion, fuel injection pressure, and coolant temperature were
investigated using the 2-dimensional Mie scattering technique. It was confirmed that the in-cylinder charge motion played
a major role in the fuel spray distribution during the induction stroke while injection timing had to be carefully considered
at high injection pressures during the compression stroke to prevent spray impingement on the piston. 相似文献