Class 4 (4th Engineer) MEKM 📅 Jun 2024

Exam Question

With reference to turbochargers:

(a) Explain the term surging, stating how it occurs, its effect on the turbocharger and how it can be avoided (8)

(b) Describe the procedures for cleaning EACH of the following and explain the precautions which should be taken: (8)

(i) Suction air

(ii) Turbine blades and nozzle ring

Reference Answer

### (a) Explanation of Surging, its Occurrence, Effects, and Avoidance
**1. Explanation of Surging:**
Turbocharger surging is an unstable operating condition characterized by rapid, cyclical fluctuations in the airflow, pressure, and sometimes rotational speed on the compressor side of the turbocharger. It typically manifests as a distinct "whooshing" or "bellowing" sound. Essentially, the compressor temporarily loses its ability to maintain a stable flow of air against the pressure in the scavenge air receiver and begins to stall, reverse flow, and then re-establish flow, only to repeat the cycle.
**2. How Surging Occurs:**

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