3000 气体动力学基础（Fundamentals of Gas Dynamics）(厦门大学) 最新满分章节测试答案

文章目录[隐藏]

Chapter3 Control Volume Analysis Control Volume Analysis test
Chapter4 Introduction to Compressible Flow Compressible Flow test
Chapter7 Moving and Oblique Shocks Moving and Oblique Shocks test
Chapter5 Varying-Area Adiabatic Flow Varying-Area Adiabatic Flow test
Chapter6 Standing Normal Shock Standing Normal Shock test
Chapter8 Prandtl Meyer Flow Prandtl Meyer Flow test
Chapter1 Introduction Introduction test
Chapter2 Control Volume Analysis Control Volume Analysis test
Chapter9 Fanno Flow Fanno Flow test
Chapter10 Rayleigh Flow Rayleigh Flow test

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Chapter3 Control Volume Analysis Control Volume Analysis test

1、问题:Pressure taps in a low-speed wind tunnel reveal the difference between stagnation and static pressure to be 0.5 psi. Calculate the test section air velocity under the assumption that the air density remains constant at 0.0765 lbm/ft3.
选项：
A:157ft/sec
B:248ft/sec
C:175ft/sec
D:44ft/sec
答案: 【248ft/sec】

2、问题:Water flows through a duct of varying area. The difference in stagnation pressures between two sections is 4.5 × N/. If the system is perfectly insulated against heat transfer, compute the temperature change of water as it flows through the duct.
选项：
A:0.11K
B:0.22K
C:0.24K
D:0.09K
答案: 【0.11K】

3、问题:Water flows in a 2-ft-diameter duct under the following conditions: p1 = 55 psia and V1 = 20 ft/sec. At another section 12 ft below the first, the diameter is 1 ft and the pressure p2 = 40 psia. Determine the direction of flow.
选项：
A:2 to 1
B:1 to 2
C:stable
D:impossible
答案: 【2 to 1 】

4、问题:Seawater (ρ = 64 lbm/) flows through the reducer shown in Figure with p1 =50 psig. The flow losses between the two sections amount to h = 5.0 ft-1bf/lbm. Determine the force exerted by the reducer on the seawater between sections 1 and 2.
选项：
A:1800lbf
B:3600lbf
C:3200lbf
D:1600lbf
答案: 【3600lbf 】

5、问题:Neglect all losses in Figure. If the opening is 4 in. in diameter. Compute the force tending to push the tank along the floor.
选项：
A:87lbf
B:174lbf
C:151lbf
D:100lbf
答案: 【151lbf 】

Chapter4 Introduction to Compressible Flow Compressible Flow test

1、问题:If γ = 1.2 and the fluid is a perfect gas, what Mach number will give a temperature ratio of T /Tt = 0.909? What will the ratio of p/pt be for this flow?
选项：
A:0.564
B:0.705
C:0.716
D:1.39
答案: 【0.564】

2、问题:Carbon dioxide with a temperature of 335 K and a pressure of 1.4 × N/ is flowing with a velocity of 200 m/s. Determine the stagnation density. (CO : R = 189N • m/kg • K, γ = 1.29)
选项：
A:2.8
B:4.2
C:3.2
D:2.1
答案: 【2.8】

3、问题:Helium flows in a duct with a temperature of 50°C, a pressure of 2.0 bar abs., and a total pressure of 5.3 bar abs. Determine the velocity in the duct. (He : R = 2080N • m/kg • K, γ = 1.67)
选项：
A:498m/s
B:1266m/s
C:621m/s
D:996m/s
答案: 【1266m/s 】

4、问题:Air flows through a constant-area, insulated passage. Entering conditions are T1 =520°R, p1 = 50 psia, and M1 = 0.45. At a point downstream, the Mach number is found to be unity. Determine the wall frictional force if the duct is 1 ft in diameter.
选项：
A:1576lbf
B:788lbf
C:394lbf
D:688lbf
答案: 【1576lbf 】

5、问题:Carbon dioxide flows in a horizontal adiabatic, no-work system. Pressure and temperature at section 1 are 7 atm and 600 K. At a downstream section, p2 = 4 atm., T2 =550 K, and the Mach number is M2 = 0.90. Determine the area ratio A2/A1.
选项：
A:0.763
B:0.653
C:0.382
D:0.542
答案: 【0.763】

Chapter7 Moving and Oblique Shocks Moving and Oblique Shocks test

1、问题:Air flows in a duct, and a valve is quickly closed. A normal shock is observed to propagate back through the duct at a speed of 1010 ft/sec. After the air has been brought to rest, its temperature and pressure are 600°R and 30 psia, respectively. What were the original velocity of the air before the valve was closed?
选项：
A:348.26ft/sec
B:1010ft/sec
C:1358.26ft/sec
D:661.74ft/sec
答案: 【348.26ft/sec 】

2、问题:An oblique shock forms in air at an angle of θ = 30°. Before passing through the shock, the air has a temperature of 60°F, a pressure of 10 psia, and is traveling at M = 2.6. What is the deflection angle?
选项：
A:9.1°
B:20.9°
C:13.2°
D:15.7°
答案: 【9.1°】

3、问题:A pitot tube is installed in a wind tunnel in the manner shown in Figure. The tunnel air temperature is 500°R and the static tap (p1) indicates a pressure of 14.5 psia. Suppose that = 26 psia. What is the tunnel velocity under this condition?
选项：
A:1045ft/sec
B:1095ft/sec
C:995ft/sec
D:945ft/sec
答案: 【1045ft/sec 】

4、问题:Pictured in Figure is the air inlet to a jet aircraft. The plane is operating at 50,000 ft, where the the pressure is 243 psfa and the temperature is 392°R. Assume that the flight speed is M0 = 2.5. What are the entropy change of the air just after it passes through the normal shock?
选项：
A:0.0220Btu/lbm -°R
B:0.0110Btu/lbm -°R
C:0.0150Btu/lbm -°R
D:0.0180Btu/lbm -°R
答案: 【0.0220Btu/lbm -°R 】

5、问题:A round-nosed projectile travels through air at a temperature of -15°C and a pressure of 1.8 × N/. The stagnation pressure on the nose of the projectile is measured at 2.1 × N/. Now assume that the nose tip is shaped like a cone. What is the maximum cone angle for the shock to remain attached?
选项：
A:49°
B:40°
C:45°
D:54°
答案: 【49°】

Chapter5 Varying-Area Adiabatic Flow Varying-Area Adiabatic Flow test

1、问题:Air enters a converging section where A1 = 0.50 m2. At a downstream section A2 =0.25 m2, M2 = 1.0, and = 0. It is known that p2 > p1. Find the temperature ratio (T2/T1).
选项：
A:1.64
B:0.833
C:0.508
D:1.34
答案: 【1.64】

2、问题:Oxygen flows into an insulated device with initial conditions as follows: p1 = 30 psia,T1 = 750°R, and V1 = 639 ft/sec. The area changes from A1 = 6 ft2 to A2 = 5 ft2. What is this device?
选项：
A:nozzle
B:diffuser
C:straight tube
D:impossible
答案: 【nozzle】

3、问题:Air flows with T1 = 250 K, p1 = 3 bar abs., pt1 = 3.4 bar abs., and the cross-sectional area A1 = 0.40 m2. The flow is isentropic to a point where A2 = 0.30 m2. Determine the temperature at section 2.
选项：
A:239K
B:250K
C:262K
D:274K
答案: 【239K】

4、问题:Carbon monoxide flows through an adiabatic system. M1 = 4.0 and pt1 = 45 psia. At a point downstream, M2 = 1.8 and p2 = 7.0 psia. Determine the ratio of A2/A1.
选项：
A:0.15
B:0.12
C:6.67
D:8.33
答案: 【0.15】

5、问题:Nitrogen is stored in a large chamber under conditions of 450 K and 1.5 × N/. The gas leaves the chamber through a convergent-only nozzle whose outlet area is 30 cm2. The ambient room pressure is 1 × N/ and there are no losses. What is the maximum flow rate that could be obtained by lowering the ambient pressure?
选项：
A:0.844kg/s
B:0.422kg/s
C:0.211kg/s
D:0.311kg/s
答案: 【0.844kg/s 】

Chapter6 Standing Normal Shock Standing Normal Shock test

1、问题:The difference between the total and static pressure before a shock is 75 psi. What is the maximum static pressure that can exist at this point ahead of the shock? The gas is oxygen. (Hint: Start by finding the static and total pressures ahead of the shock for the limiting case of M = 1.0.)
选项：
A:84psia
B:75psia
C:90psia
D:94psia