Chapter 7: 1. (8 Points) Refer to Problem 7.2: Write the chemical reaction for the combustion of hydrogen, H2, and air then calculate the stoichiometric fuel-to-air ratio, fich (Note: the ratio of Oxygen to Nitrogen in normal air is 21:79). 2. (8 Points) Refer to Problem 7.4: Write the chemical reaction for the complete combustion of JP-4 and air. JP-4 has the formula CH193. Also, calculate the stoichiometric fuel-to-air ratio for this blended jet fuel. 3. (8 Points) Refer to Problem 7.17: Calculate the lower and higher heating values of propane, C3H8, in the following chemical reaction at a reference temperature of 298.16 K and the pressure of 1 bar. C3HB()+502) 3CO2(g) + 4H2O 4. (8 Points) Similar to Problem 7.20: An annular combustor utilizes a dump prediffuser a shown (see Figure P7.20, pg. 520, but use the parameters in this problem). From the figure: ARI=0.33 m; AR2=0.6 m; RCL = 1 m ing the inlet Mach number is M1 = 0.5 and y = 1.4, Calculate: a. The diffuser area ration AVAI b. The total pressure loss Appa (Hint: Calculate with Equation 7.116 then logic check with Figure7.43) c. Exit Mach Number M. (Estimate from Figure 7.43) 5. (8 Points) Refer to Problem 7.26: Atmospheric ozone is depleted through catalytic intervention of nitric oxide (NO). NO emissions in the upper atmosphere are estimated to be 30 g/kg fuel from high-temperature engines, overextended cruise periods. A supersonic transport carries 50,000 kg of fuel at takeoff. Assuming 90% of the fuel is consumed during cruise, calculate the amount of nitic oxide emissions for a round trip flight. Now multiply that by 360 round trips per year to estimate the (NO) pollution (of one aircraft) per year. Finally, what is the environmental impact of a fleet of 100 aircraft? 6. (12 Points) Describe the airflow through and operation of a turbine combustor. 7. (12 Points) Describe ways thrust can be augmented without the increase in engine speed or turbine temperature. 8. (12 Points) Describe the operation of multi-can, annular, and can-annular combustors, including advantages and disadvantages of each type. Give an example of an engine for each type. 9. (12 Points) Discuss three of the most prevalent aircraft combustion-generated pollutants (e.g., CO, NO, CO2, NO2). Include how they are generated, their environmental impact, and any plans for reduction, current or future. 10. (12 Points) Discuss the design and nature of afterburners. Be sure to include a discussion of the typical power increase vs. the typical additional fuel burned.