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PROBLEMS 1. On a very hot day, 95 oF (35 oC), a 5.0 L Mustang is running at 2500 rpm. That means that in 1 minute 12,500 L of air are taken in. If 25,300 L of gas come out the exhaust, what is the exhaust temperature in oC? 2. Consider the effect of burning gasoline, C8H18. In the engine, gasoline combines with oxygen to pro- duce carbon dioxide and water vapor according to the equation 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O Since both O2 and CO2 are gases, the coefficients can be used as volume ratios. This means that reacting 25 L of oxygen would produce 16 L of carbon dioxide and 18 L of water vapor. If 250. L of oxygen enter the engine at 25 °C, how many liters of carbon dioxide would exit the exhaust at 400 °C? 3. The diagram to the right represents a J85 jet engine working at a speed of 615 mph and an altitude of 22,260 ft. In the table below are the temperature readings at each of the marked stations of the engine. Considering only the changes in absolute temperature, what would the volume of 900. ft3 of air at station 0 become at each of the stations on the chart? Temperature variations in turbine engine. 4. Use the temperatures from the previous problem and the engine temperature ratios (ETRs) for the compressor (Tt3/Tt2), burner (Tt4/Tt3), turbine (Tt5/Tt4), and nozzle (Tt8/Tt5), calculate how much a given volume of gas would change as it moved through each part of the engine if the temperature change were the only factor. compressor = ______ burner = ______ turbine = ______ nozzle = ______ (a) In which part of the engine is the overall change the greatest? (b) Why is this the case? (c) Now calculate the total ratio for the whole engine (Tt8/Tt2). (d) Comment on the significance of this ratio being larger than one. Charles’s Law Station 0 2 3 4 5 8 Temp 282 K 282 K 567 K 634 K 368 K 368 K Volume 900 ft3 32PDF Image | NASA Guide to Engines
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