This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
In Cylinder High Speed and Stroboscopic Video Observation of Spray Development in a DI Diesel Engine
Annotation ability available
Sector:
Language:
English
Abstract
For high-speed imaging a newly developed eight-fold CCD camera, which permits framing rates of up to one million pictures per second, was used to obtain pictures of the injected sprays during the operation of a diesel engine. For the particular case studied here the framing rate was set at 50,000 pictures per second. This rate was sufficient to resolve the temporal development of the sprays in the transparent version of the four-cylinder, in-line, 1.9 litre DI production diesel engine of Volkswagen. The advantage of the camera is that it needs no light pulses for illumination, but can operate with a continuous light source. Each of the CCD chips is arranged around a central eight face reflecting pyramid, which splits the light coming from the camera lens to each CCD chip. The chips can be shuttered freely (asynchronously) at programmable inter-frame spacings thus permitting operation with continuous illumination. In this particular case a 30 Watt halogen lamp was used. Also stroboscopic pictures of the sprays were taken with one CCD camera at different delay times after the beginning of injection showing the cycle to cycle variations of the spray structure. As an example of the results obtained with these techniques, a comparison between the sprays resulting from two-spring and one-spring injectors was made, showing that in the first stage of lift of the two-spring injector the sprays are more disperse but at the same time more stochastic in shape compared to those of a one-spring injector.
Authors
Citation
Chaves, H., Hentschel, W., Obermeier, F., and Stasicki, B., "In Cylinder High Speed and Stroboscopic Video Observation of Spray Development in a DI Diesel Engine," SAE Technical Paper 961206, 1996, https://doi.org/10.4271/961206.Also In
References
- Hentschel, W. Hesse, A. Schindler, K.-P. Experimental investigation of spray formation and combustion in a real Diesel engine Auto-Tech Seminar C399/19 (IMechE) 1989
- Schindler, K.-P. Hentschel, W. Whitelaw, J. Arcoumanis, C. Wolfrum, J. Arnold, A. Leipertz, A. Münch, K.-U. April 1991 405 417 1991
- Soteriou, C. Andrews, R.J. Smith, M. Cavitation, Hydraulic Flip and Atomization in Direct Injection Diesel Sprays SAE paper 950081
- Chaves. H. Hentschel, W. Obermeier, F. Schindler, K.-P. Weiss, D. Fuel Spray in Diesel Engines, Part II: Spray Propagation and Wall Interaction Proc. of 3rd Int. Conf.: Innovation and Reliability in Automotive Design and Testing Florence 761 772 1992
- Stasicki, B. Hiller, W.J. Meier, G.E.A- Light Pulse Generator for High Speed Photography Using Semiconductor Devices as a Light Source Optical Engineering 29 7 821 827 1990
- Stasicki, B. Meier, G.E.A- A computer controlled ultra high-speed video camera SPIE Proc. of 21 st Int. Congress on High-Speed Photography and Photonics Korea 1994
- Arcoumanis, C. Bae, C.S. Nagwaney, A. Whitelaw, J.H Effect of EGR on Spray Development and Combustion in a 1.9L DI Diesel Optical Engine SAE paper 950850
- Arcoumanis, C. Hu, Z. Nagwaney, A. Spray and Combustion Visualization in Direct Injection Diesel Engines IMechE Seminar on “Measurement and Observation Analysis of Combustion in Engines” London 22 March 1994