Engineering >> Mechanical EngineeringPressure-Time Curve in a Compression-Ignition Engineby Brandon Smith
Submitted : Spring 2011 The purpose of this project was to determine 4 things about the pressure in a compression-ignition (CI) engine using a pt (pressure-time) curve. These 4 things were: 1) a graph of pressure versus degree of the crankshaft, 2) a value for the maximum pressure and the angle it occurs at, 3) a value for the maximum pressure rise rate and the angle it occurs at, and 4) a value for the maximum pressure acceleration that occurs on pressure rise and the angle it occurs at. Given a set of data for different pressure rise rates at different angles, we can use simple integration and differentiation techniques in order to get the values we seek. By graphing the data set or by simply finding the largest number within the appropriate table we find the answers to each of the questions, the maximum pressure being 1,016.55 psi at 7°, the maximum pressure rise rate being 30.6 psi/deg at 0°, and the maximum pressure acceleration being 0.85 psi/deg2 at -15°. Related Links:
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