AVM Powerplant Practice Test 2026 – The Complete Guide to Master Your Certification!

A bellmouth inlet uses a smooth, flared entrance to guide air into the duct with minimal flow disturbance. This design reduces flow separation and lower losses at the entry, so more of the dynamic pressure is recovered as usable pressure at the compressor face. The result is a uniform, efficient flow into the engine, maximizing the inlet’s aerodynamic efficiency. While a smooth inlet can help with surge tendency and distortion, its primary purpose is to maximize pressure recovery and overall efficiency of the inlet. It does not aim to increase pressure drop or rely on ram effects at low speeds.