The Effects of Inlet Conditions on Detonations

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Presentation transcript:

The Effects of Inlet Conditions on Detonations Leigh Honeycutt MAE 5310: Combustion Fundamentals

Motivation Detonation Driven Shock Tunnels Pulse Detonation Engines Pulse Detonation Rockets

Project Overview Solve the equations for the detonation wave at the upper Chapman Jouguet Point for a hydrogen-oxygen detonation. Examine the effects of varying Inlet Pressure Fuel to Air ratio Inlet Temperature

Equations State Equations

Equations Mixture Equations

Table 1: Log Kf values vs. Temperature Cp Values from Fundamentals of Thermodynamics Table 1: Log Kf values vs. Temperature Table 2: Values

Numerical Method System of Nonlinear Equations Assume a T2 and final mixture Solve the state equations for P2 Determine the mixture using P2 and T2 Damped Newton’s Method Check to see if the equation for T2 is balanced. If it is balanced, the assumed T2 is correct, otherwise change T2 and reiterate.

Fuel to Air Ratio

Fuel to Air Ratio

Fuel to Air Ratio

Inlet Pressure

Inlet Pressure

Inlet Pressure

Inlet Temperature

Inlet Temperature

Inlet Temperature

References Glassman, Irvin. Combustion. San Diego: Academic Press, 1996. Kirk, Daniel R. MAE: 5310: “Combustion Fundamentals Lecture 27: Detonation”. Florida Institute of Technology. Dec 6, 2005. Sontag, Richard E., Claus Borgnakk, & Gordon J. Van Wylen. Fundamentals of Thermodynamics. New York: John Wiley & Sons, Inc., 1998

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