Quantitative Time Resolved 2-D Fuel-Air Ratio Measurements in a Hydrogen Direct Injection SI Engine Using Spontaneous Raman Scattering 961101
A two-dimensional technique for the quantitative determination of the fuel-air ratio in hydrogen fuelled engines has been developed. The technique is based on the spontaneous Raman scattering of the hydrogen molecules (Stokes Q-branch) and the simultaneous measurement of the pressure inside the combustion chamber. From these data the local partial pressure of the hydrogen and, therefore, the fuel-air ratio can be calculated.
This method was applied in a single cylinder direct injection research engine in order to prove the applicability of this technique under real engine conditions. The measurements inside the side chamber of the engine show a fast mixing process of the compressed air and the injected hydrogen (6 MPa injection pressure) independent of the injection timing.
Citation: Meier, F., Wiltafsky, G., Köhler, J., and Stolz, W., "Quantitative Time Resolved 2-D Fuel-Air Ratio Measurements in a Hydrogen Direct Injection SI Engine Using Spontaneous Raman Scattering," SAE Technical Paper 961101, 1996, https://doi.org/10.4271/961101. Download Citation
Frank Meier, Georg Wiltafsky, Jürgen Köhler, Wolfgang Stolz
University of Stuttgart
International Fuels & Lubricants Meeting & Exposition