• Title/Summary/Keyword: spray width

Search Result 114, Processing Time 0.018 seconds

Effect of Ambient Conditions on Spray Behavior of Gasoline Injector (가솔린 분무 거동에 미치는 분위기 조건의 영향)

  • 이창식;이기형;최수천;권상일
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.8 no.2
    • /
    • pp.27-32
    • /
    • 2000
  • The main objective of this work is to investigate the effect of ambient conditions on the spray behavior and spray characteristics of high-pressure fuel injector. For this purpose, the effects of ambient pressure and temperature on the spray characteristics have been studied by applying the analysis of visualization system and phase Doppler particle analyzer. In this experiment, the visualization of spray behavior was performed under various ambient gas conditions and injection parameters such as gas temperature, ambient pressure, injection pressure of injector, and axial distance from the nozzle tip. Based on the investigation results, the spray tip penetration and spray width decrease with the increase of ambient gas pressure in the spray chamber. The effects of the spray parameters on the microscopic characteristics of gasoline spray were discussed.

  • PDF

Study on the Spray Characteristics of a Port Fuel Injector for a Gasoline Engine (가솔린엔진용 포트분사식 인젝터의 분무특성에 관한 연구)

  • Lee, Sang-In;Lee, Sung-Won;Park, Sung-Young
    • Journal of ILASS-Korea
    • /
    • v.15 no.2
    • /
    • pp.61-66
    • /
    • 2010
  • Fuel spray characteristics of the gasoline engine injector has been studied experimentally. To provide fundamental performance data of 4-hole and 12-hole injectors, spray fuel-mass distribution, wall wetting fuel amount and visualization of injectors have been tested and measured with various fuel supply pressure conditions. Spray visualization has been performed to analyze spray formation, spray angle, stream width and penetration length. Test result shows that wall wetting is greatly influenced by the induction air amount and spray atomization. Spray visualization shows that the 12-hole injector has robust performance characteristics with various fuel supply pressure conditions compared with the 4-hole injector. 4-hole injector generates relatively less wall-wetting fuel amount than 12-hole injector does.

Analysis of the Impinging Spray Behavior Accompanying with Change of Phase (상변화를 동반한 충돌분무의 거동해석)

  • Song, Hong-Jong;Cha, Keun-Jong;Kim, Duck-Jool
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.24 no.6
    • /
    • pp.852-859
    • /
    • 2000
  • The emission in the exhaust gas from diesel engine is effected by the fuel spray characteristics. The spray of D.I. diesel engine impinges on a piston cavity and a cylinder wall. It is very important to know exactly the distribution and behavior of the spray inside cylinder. The objective of this study is to develop more accurate evaporation model. The EPISO code was used to analyze the flow characteristics in the engine. The Wakil model and the Faeth model are applied to the EPISO code to analyze the behavior of impinging spray. And also experimental and numerical analysis were carried out. The spray behavior characteristics were investigated by changing injection pressure, ambient pressure and temperature. The behavior of impinging spray was strongly effected by the change of ambient pressure and temperature. The effects of evaporation and rebounding droplet should be considered.

External Spray Characteristics of Deflector Nozzle (충돌형 노즐의 분무형상 연구)

  • Kim, K.H.;Choi, Y.H.;Yoon, S.J.
    • Journal of ILASS-Korea
    • /
    • v.7 no.1
    • /
    • pp.29-35
    • /
    • 2002
  • This study describes the external spray characteristics of deflector nozzle such as the breakup procedures of liquid sheet, spray angle, breakup length and bubble behaviors of spray at deflector nozzle. In order to visualize the spray behaviors shadow graphy technique were used. According to the increase injection pressure, deveopment of the spray passes through the dribbling, distoted jet, closed bubble due to the contraction by form a conical sheet like as the simplex swirl atomizer. As trying the analysis of the ratio of bubble length and width it was found that the ratios is comparable. Spray cone angle was nearly $90^{\circ}$.

  • PDF

Spray Characteristics of High-Pressure Injector in Direct-Injection Gasoline Engine (직분식 가솔린 기관 고압 인젝터의 연료 무화 특성)

  • 이창식;최수천;김민규
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.7 no.8
    • /
    • pp.1-6
    • /
    • 1999
  • An experimental study was carried out to investigate the global spray behavior and spray characteristics of high-pressure fuel injector in the direct-injection goasoline enginet. The atomization characteristics of fuel spary such as mean droplet size, mean velocity , and velocity distribution were measured by the phase Doppler particle analyzer. The spray tip penetration and spray width were investigated by the result fo visualizaiton experiment. The quantitiative spary characteristics of injector spray were measured under various sparay conditions and ambient pressures. The results of experiment show that the increase in ambient pressure have influence on the spray tip penetration and spray development process. Also, the influence of injection pressure and measuring location on the mean velocity and droplet size distribution were discussed.

  • PDF

The Effect of Extended Collision Model on a Spray (확장 충돌 모델이 분무계산에 미치는 영향)

  • 한진희;조상무;박권하
    • Journal of Advanced Marine Engineering and Technology
    • /
    • v.26 no.2
    • /
    • pp.181-191
    • /
    • 2002
  • Spray calculation has been studied to understand the behavior of the spray in a combustion chamber But the spray dispersion has not been predicted properly in a high velocity injection spray or a wall impaction spray. In this study the extended grazing collision model is applied to improve the problem. The gas phase is modelled by the Eulerian continuum conservation equations of mass, momentum, energy and fuel vapour fraction. The liquid phase is modelled following the discrete droplet model approach in Lagrangian form. The droplet distributions, penetration, width and gas flows are compared for the cases with or without extended model. The extended collision model makes the results better.

Visualization and Numerical Analysis of Non-evaporating Spray with a Swirl-Type GDI Injector (GDI 와류 분사노즐에 의한 비증발 분무의 가시화 및 수치해석)

  • 원영호;강수구
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.11 no.4
    • /
    • pp.22-28
    • /
    • 2003
  • Predictions of the fuel spray dispersion and mixing processes are very important to improve the fuel consumption and exhaust emissions in GDI engines. Numerical and experimental analysis of the sprays with a swirl injector have been conducted. A numerical analysis is carried out using KIVA-II code with modified spray models. Experimental measurements are performed to show the global spray images and the local images near nozzle tip using laser sheet visualization technique. Computed and measured spray characteristics such as spray width, tip penetration are compared, and good agreements can be achieved. The spray head vortex is stronger as the injection pressure increases, but numerical calculations cannot show the head vortex properly.

An Experimental Studies on Impingement Spray Characteristic in High Temperature and Pressure Chamber (고온고압용기에서 충돌분무 특성에 관한 실험적 연구)

  • 안병규;류호성;오은탁;송규근;정재연
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.10 no.3
    • /
    • pp.36-43
    • /
    • 2002
  • The characteristics of spray has much effect on performance and emissions for automobile, diesel engine, gas turbine and combustion engines. So spray behavior after impinging the wall is very important for prediction the engine performance. This studies examined about impingement spray considering ambient density(18,24,30kg/ms), temperature(293,473K), impingement angle(0,30,45°). The images of impingement spray were obtained by the high speed video camera. After that we analyzed impingement spray characteristics to use this images. In this experiment, we found that 1) The spray width is reduced by increasing the ambient gas density and temperature,2) The growth of downstream is increased by increasing the impingement angle.

Fuel Spray Characteristics of GDI Injector (직분식 가솔린기관 인젝터의 연료 분무 특성)

  • Kwon, Sang-Il;Lee, Chang-Sik
    • 한국연소학회:학술대회논문집
    • /
    • 2000.12a
    • /
    • pp.194-201
    • /
    • 2000
  • This paper is intended to analyze the macroscopic behavior and transient atomization characteristics of the high-pressure gasoline injector in direct-injection gasoline engine. The global spray behavior of fuel injector was visualized by shadowgraph technique. Time-resolved droplet axial and radial velocity components and droplet diameter were measured at many probe positions in both axial and radial directions by a two-component phase Doppler particle analyzer (PDPA). In order to obtain the influence of fuel injection pressure, the macroscopic visualization and experiment of particle measurement on the fuel spray were investigated at 3,5 and 7 MPa of injection pressure under different surrounding pressure in the spray chamber. The results of this work show that the fuel injection pressure of gasoline injector in GDI engine has influence upon the mean droplet diameter, mean velocity of spray droplet, the spray tip penetration, and spray width under the elevated ambient pressure.

  • PDF

Spray Plume Characteristics of Liquid Jets in Subsonic Crossflows (수직분사제트의 액적영역 분무특성에 대한 연구)

  • Song, Jin-Kwan;Ahn, Kyu-Bok;Oh, Jeong-Seog;Yoon, Young-Bin
    • Journal of ILASS-Korea
    • /
    • v.11 no.2
    • /
    • pp.113-120
    • /
    • 2006
  • The effect of internal liquid flow on spray plume characteristics was performed experimentally in subsonic cross flows. The injector internal flow was classified as three modes such as a normal, cavitation, and hydraulic flip. The objectives of the research are to investigate the effect of internal liquid flow on the spray plume characteristics and compare the trajectory of spray plume with previous works. The results suggest that the trajectory and width of spray plume can be correlated as a function of liquid/air momentum flux ratio(q), injector diameter and normalized distance from the injector exit(x/d). It's also found that the injector internal turbulence influences the spray plume characteristics significantly.

  • PDF