Abstract: Two different methods to improve the thermal efficiency and reduce the emissions from lean-burn natural-gas fueled engines have been developed and are described in this paper. One method used ...

Abstract: The boundary layer on an axial-flow compressor stator blade has been measured using an ensemble-averaging technique. Although the mean velocity profiles appear to indicate fully developed turbulent ...

Abstract: Turbulence and unsteadiness levels downstream of an axial-flow compressor rotor have been measured using an ensemble-averaging technique. Free-stream turbulence levels are lowest near the compressor ...

Abstract: The work presented in this paper compares the performance and emissions of the UBC “Squish-Jet” fast-burn combustion chamber with a baseline bowl-in-piston (BIP) chamber. It was found that the ...

Abstract: A simple two-zone mass transfer model was used to predict the mean squish velocity history at the rim of a conventional bowl-in-piston combustion chamber. The chamber’s geometry produces gas ...

Abstract: An existing integral boundary layer calculation procedure is modified to predict turbulent boundary layers developing in a turbulent freestream. Extra terms in both the turbulence model equation ...

Abstract: The two-dimensional momentum integral equation is derived for the case where free-stream turbulence or ordered unsteadiness exist. It is shown that extra terms may arise, of which one, the shear ...

Abstract: A series of tests was conducted on a Toyota, four-cylinder, spark ignition engine which was modified to run on either gasoline or natural gas. The aim of the experiment was to investigate ...