Question
Flow is directed along a wedge-shaped spike in a type of these devices called the aerospike. For 10 points each:
[10m] Name these devices that control the exit flow properties of exhaust streams from engines. Most rockets use “converging-diverging” examples of these devices named for Gustav de Laval, which narrow at the throat and then expand.
ANSWER: nozzles
[10h] The flow through a rocket nozzle is designed to achieve this specific flow condition at the throat, at which the mass flow rate is maximized and no longer increases regardless of changes in downstream conditions.
ANSWER: choked flow [or critical flow]
[10e] Nozzles achieve optimal thrust efficiency when this quantity for the exhaust stream is equal to its ambient value. According to Bernoulli’s principle, this quantity decreases as flow velocity increases.
ANSWER: pressure
<VD, Physics>
Summary
| 2024 ARCADIA at BU | 2024-12-06 | Y | 5 | 8.00 | 60% | 20% | 0% |
| 2024 ARCADIA at Duke | 2024-12-06 | Y | 3 | 13.33 | 67% | 67% | 0% |
| 2024 ARCADIA at Missouri S&T | 2024-12-06 | Y | 2 | 20.00 | 50% | 50% | 100% |
| 2024 ARCADIA Online | 2025-05-17 | Y | 5 | 12.00 | 100% | 20% | 0% |
| 2024 ARCADIA at Penn State | 2024-12-06 | Y | 2 | 10.00 | 100% | 0% | 0% |
| 2024 ARCADIA at Florida Tech | 2024-12-06 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ARCADIA at UC Berkeley | 2024-12-06 | Y | 2 | 15.00 | 100% | 50% | 0% |
| 2024 ARCADIA at Waterloo | 2024-11-09 | Y | 6 | 11.67 | 83% | 17% | 17% |
| 2024 ARCADIA at GT | 2024-12-06 | Y | 5 | 16.00 | 100% | 40% | 20% |
| 2024 ARCADIA at Illinois | 2024-11-09 | Y | 4 | 10.00 | 50% | 25% | 25% |
| 2024 ARCADIA at Warwick | 2024-12-06 | Y | 5 | 4.00 | 0% | 40% | 0% |
| 2024 ARCADIA at Claremont | 2024-11-02 | Y | 3 | 16.67 | 100% | 67% | 0% |
Data
| Truman | Missouri | 10 | 10 | 10 | 30 |
| Squidward Community College | WashU | 0 | 10 | 0 | 10 |