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ASE 362K - Practice Exam 2

# ASE 362K - Practice Exam 2 - EXAM 1 Spring 2009 ASE 362K...

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EXAM 1 Spring 2009 ASE 362K Problem 1. (5 pts) Briefly explain why adiabatic expansion processes are more likely to be isentropic than adiabatic compression processes. Problem 2. (15 pts) A steady flow of air passes through the channel shown. The conditions at station 1 are: P 1 = 10 atm, T 1 = 500 K, A 1 = 10 cm 2 and ݉ =2 kg/s. If 200 kW of heat are added to the flow and the exit temperature is T 2 = 300 K and exit area is A 2 =5 cm 2 . Determine the pressure at station 2. (Note: This is not a Rayleigh flow problem.) 1 2 Sample Exam

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Problem 3. (20 pts) An ejector is a device that uses a high-speed jet of air to induce a low-pressure region (vacuum) in a secondary flow path. Ejectors are used in supersonic wind tunnels to enable higher Mach numbers to be achieved. A simplified ejector is shown below. A high speed central jet (called the primary jet) issues into a larger tube. The primary jet mixes with the surrounding fluid and accelerates it to high velocity. This causes a lower pressure at the entrance to the secondary tube (station 1) and draws the air into it. You are given the following:
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ASE 362K - Practice Exam 2 - EXAM 1 Spring 2009 ASE 362K...

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