Question

An aircraft flies at 90 km/hr. One of its turbojet engines takes in 40 kg/s of air and expands the gases to the ambient pressure. The air-fuel ratio is 50 and the lower calorific value of fuel is 43 MJ/kg. Find: 1. Thrust power options: a. 56 MW b. 560 W c. 2.95 MW d. 650 kW 2. Thrust options: a. 2598 N b. 11111 N c. 104 N d. 1040 N 3. Jet velocity options: a. 50 m/s b. 500 m/s c. 5000 m/s d. 250 m/s 4. Specific impulse options: a. 49.34 s b. 99.3 s c. 79.3 s d. 5.17 s 5. The rate of air flow through the propeller options: a. 402.96 kg/s b. 4543 kg/s c. 890 kg/s d. 786 kg/s

          An aircraft flies at 90 km/hr. One of its turbojet engines takes in 40 kg/s of air and expands the gases to the ambient pressure. The air-fuel ratio is 50 and the lower calorific value of fuel is 43 MJ/kg.

Find:
1. Thrust power options:
   a. 56 MW
   b. 560 W
   c. 2.95 MW
   d. 650 kW

2. Thrust options:
   a. 2598 N
   b. 11111 N
   c. 104 N
   d. 1040 N

3. Jet velocity options:
   a. 50 m/s
   b. 500 m/s
   c. 5000 m/s
   d. 250 m/s

4. Specific impulse options:
   a. 49.34 s
   b. 99.3 s
   c. 79.3 s
   d. 5.17 s

5. The rate of air flow through the propeller options:
   a. 402.96 kg/s
   b. 4543 kg/s
   c. 890 kg/s
   d. 786 kg/s

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Added by Ronald P.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Nicholas Mogoi

11/23/2023

Step 1

Given the air-fuel ratio (AFR) is 50, and the mass flow rate of air (ṁ_air) is 40 kg/s, the mass flow rate of fuel (ṁ_fuel) can be calculated as: \[ \text{ṁ_fuel} = \frac{\text{ṁ_air}}{\text{AFR}} = \frac{40 \text{ kg/s}}{50} = 0.8 \text{ kg/s} \] Show more…

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An aircraft flies at 90 km/hr. One of its turbojet engines takes in 40 kg/s of air and expands the gases to the ambient pressure. The air-fuel ratio is 50 and the lower calorific value of fuel is 43 MJ/kg. Find: 1. Thrust power options: a. 56 MW b. 560 W c. 2.95 MW d. 650 kW 2. Thrust options: a. 2598 N b. 11111 N c. 104 N d. 1040 N 3. Jet velocity options: a. 50 m/s b. 500 m/s c. 5000 m/s d. 250 m/s 4. Specific impulse options: a. 49.34 s b. 99.3 s c. 79.3 s d. 5.17 s 5. The rate of air flow through the propeller options: a. 402.96 kg/s b. 4543 kg/s c. 890 kg/s d. 786 kg/s

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