Search Results

A new instrument for measurement of diesel in-cylinder radiation heat transfer has been designed, calibrated, and tested in a single cylinder, open chamber, turbocharged diesel engine. The unique feature of the instrument is that it measures the total radiation flux over the entire hemisphere, rather than being restricted to a finite acceptance angle of less than 2π steradians as have previous instruments. The paper gives the instrument design details and shows that a combination of polycrystalline alumina and sapphire gives an optimum receiver optics design. However a solution to the problem of bonding these two materials was not found. Thus an all polycrystalline alumina receiver was used in the prototype instrument. Results using the prototype show that keeping the receiver free of soot is a problem for an all polycrystalline alumina design. Data were thus corrected for window deposits by post-experiment calibration of the dirty receiver.