## Related questions with answers

A $\mathrm{CO}_{2}$ cartridge is used to propel a small rocket cart. Compressed gas, stored at 35 MPa and $20^{\circ} \mathrm{C}$, is expanded through a smoothly contoured converging nozzle with 0.5 mm throat diameter. The back pressure is atmospheric. Calculate the pressure at the nozzle throat. Evaluate the mass flow rate of carbon dioxide through the nozzle. Determine the thrust available to propel the cart. How much would the thrust increase if a diverging section were added to the nozzle to expand the gas to atmospheric pressure? What is the exit area? Show stagnation states, static states, and the processes on a Ts diagram. Consider the converging-diverging option. To what pressure would the compressed gas need to be raised (keeping the temperature at $20^{\circ} \mathrm{C}$) to develop a thrust of 15N? (Assume isentropic flow.)

Solution

VerifiedThe thermodynamic properties of

```
the carbon dioxide from Table A.6
```

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