[논문]SPRAY CHARACTERISTICS OF DME IN CONDITIONS OF COMMON RAIL INJECTION SYSTEM(II)

Hwang, J.S.; Ha, J.S.; No, S.Y.

SPRAY CHARACTERISTICS OF DME IN CONDITIONS OF COMMON RAIL INJECTION SYSTEM(II) 원문보기

International journal of automotive technology, v.4 no.3, 2003년, pp.119 - 124

Hwang, J.S. (Department of Agricultural Machinery Engineering, Chungbuk National University) , Ha, J.S. (Department of Agricultural Machinery Engineering, Chungbuk National University) , No, S.Y. (Department of Agricultural Machinery Engineering, Chungbuk National University)

Abstract ▼ AI-Helper

Dimethyl Ether (DME) is an excellent alternative fuel that provides lower particulate matter (PM) than diesel fuel under the same engine operating conditions. Spray characteristical of DME in common rail injection system were investigated within a constant volume chamber by using the particle motion analysis system. The injector used in this study has a single hole with the different orifice diameter of 0.2, 0.3 and 0.4 mm. The injection pressure was fixed at 35MPa and the ambient pressure was varied from 0.6 to 1.5 MPa. Spray characteristics such as spray angle, spray tip penetration and SMD (Sauter mean diameter) were measured. Spray angle was measured at 30d$_{0}$, downstream of the nozzle tip. The measured spray angie increased with increase in the ambient pressure. Increase of the ambient pressure results in a decrease of spray penetration. The experimental result, of spray penetration were compared with the predicted one by theoretical and empirical models. Increase in the ambient pressure and nozzle diameter results in an increase of SMD at a distance 30, 45 and 60d$_{0}$, downstream of the nozzle, respectively.ely.

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문제 정의

The experiment was conducted to investigate the spray characteristics of DME in conditions of common rail injection system. The conclusion revealed from this study can be summarized as
The objective of this study is to investigate the spray characteristics of DME such as spray angle, spray tip penetration and SMD by usingthe conditions of common rail injection system.

가설 설정

(2) Spray tip penetration increases with an increase in ambient pressure. This tendency is similar to the diesel spray.

제안 방법

, 1997) transmittance in the measurement of spray angle. In order to measure the spray angle in this study, the edge of spray was applied as a line of 80%transmittance.
SMD was measured by using the microscopic spray measurement function of PMAS at a distance 30, 45 and 60d_o downstream of the nozzle and edge of the spray. Spray angle, spray tip penetration and SMD were obtained by averaging the values from 30 images for each condition.
The fuel supply system in this study was organized by considering the high vapor pressure of DME. In order to avoid vaporization in the fuel line, it was pressurized from the fuel tank to the fuelpump(MS-71, Haskel INC, USA) by using nitrogen at 1.

대상 데이터

The schematic diagram of experimental apparatus used in this study was shown in Figure 1. It consists of a constant volume chamber, common rail system injector, control unit, fuel pump (Haskel, MS-71), air compressor, pressure regulator and PMAS(Particle Motion Analysis System, V-tek, Co., Korea).
The spray angle, spray tip penetration and SMD (Sauter mean diameter) were measured by using PMAS. It consists of a spark light source with very short time duration of about 50 ns, a field lens, a CCD camera and a personal computer with an image board.
2. The injector is electronically controlled common rail system one that has single hole with nozzle diameter of 0.2, 0.3 and 0.4 mm. In the case of diesel fuel, this injector operates the maximum injection pressure up to 140 MPa.

성능/효과

(1) An increase in the ambient pressure results in an increase of spray angle for measurement location of 30, 45 and 60d_o but the early injection of DME spray is not so great. It can be recommended that measurement location for DME should be between 30 and 45d_o downstream of the nozzle tip.

참고문헌 (13)

Chang, C. T. and Farrell, P. V. (1997). Effects of fuel viscosity and nozzle on high injection pressure diesel spray charactehstics. SAE Paper No. 970353
Chikachisa, T., Hishinuma, Y. and Ushida, H. (2002)Mixing condifions with spray-jet interaction for effective soot reduction in diesel combustion. Int. J. Automotive TechnoIogy 3,1, 17-25
Dan, T., Yamamoto, T., Senda, J. and Fujimoto, H. (1997). Effect of nozzle configurations for characteristics of non-reacting diesel fuel spray. SAE Paper No. 970355
Hiroyasu, H. and Arai, M. (1990). Structures of fuel spray in diesel engines. SAE Paper No. 900475
Huai, T.. Durbin. T. D.. Rhee. S. H. and Norbeck, J. M. (2003). Investigation of emission rates of ammonia, nitrous oxide and other exhaust compounds from alternative-fuel vehicles using a chassis dynamcmeter. Int. J. Automotive Technotogy 4,1,9-18
Kajitani, S., Oguma, M. and Mori, T. (2000). DME fuel blends for low-emission, direct-injection diesel engines. SAE Paper No. 2000-01-2004
Oguma, M., Hyun, G., Alam, M., Goto, S. and Kajitani, S. (2001). Effect of ambient pressure on atomization characteristics of dimehtyl ether. Proc. of the 6th Annual Conference on Liquid Atomization and Spray Systems-Asia, 11-13 Oct., Busan, Korea, 196-231
Oh, S. K., Baik, D. S. and Han, Y. C. (2002). c. Int. J. Automotive Technotogy 3, 3, 111-115
Sorenson, S. C., Bek, B. H., Glensvig, M. and Abeata, D. L. (1998). Dimethyl ether injection studies. Proc. of the Second Int. Workshop on Advanced Spray Com-bustion. 24-26 Nov., Hiroshima, Japan, 151-164
Wakai, K., Nishida, K., Yoshizaki, T. and Hiroyasu, H. (1999). Spray charactehstics of dimethyl ether from a DI diesel injection nozzle. Trans. of JSAE 30, 1, 41-47
Wakuri, Y., Fuji, M., Amitani, T. and Tsuneya, R. (1960). Studies on the penetration of fuel spray in a diesel engine. BuUetin of JSME 3, 9, 123-130
Xu, M., Nishida, K. and Hiroyasu, H. (1992). A practical calculation method for injection pressure and spray penetration in diesel engines. SAE Paper No. 920624
Yoshijaki, T., Wakai, K., Nishida, K. and Hiroyasu, H. (1998). Experimental and numedcal analysis on spray tip penetration of DME spray. 7th Symposium (ILASS-Japan) on Atomiwtion, 21-23 Dec., Gunma University. Japan, 184-188

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