Discussion
Serrations on an exhaust nozzle trailing edge that reduce jet mixing noise are called _____.
Answer: C
Correct answer: chevrons
Chevrons are the triangular serrations at the trailing edge of a nacelle or nozzle. They shed streamwise vortices that promote finer-scale mixing between the jet and the surrounding air.
Breaking up the large turbulent structures at the shear layer shifts the acoustic energy to higher frequencies, which the atmosphere absorbs far more rapidly, and reduces the low-frequency content that carries to the ground. A small thrust penalty is accepted for the noise benefit, which is significant on takeoff.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development