Exam Question
Describe following terms with respect to Diesel Engine with suitable diagram:
(a) Natural Aspiration. (4)
(b) Scavenging. (4)
(c) Supercharging. (4)
(d) Types of Super charging in two stroke engine. (4)
Class 4 (4th Engineer)
MEKM
📅 Sep 2024
Reference Answer
**(a) Natural Aspiration**
Natural aspiration refers to the method by which an internal combustion engine draws in air for combustion solely by utilizing the pressure differential created by the downward movement of the piston during the intake stroke. It relies entirely on the atmospheric pressure, which forces air into the cylinder as the pressure inside the cylinder drops below atmospheric.
* **Concept:** In a naturally aspirated engine, the intake manifold is open to the atmosphere (typically through an air filter). As the piston moves downwards, it increases the volume within the cylinder, thereby creating a partial vacuum. The higher atmospheric pressure outside then pushes air into this lower-pressure region until the cylinder is largely filled.
* **Mechanism:**
Natural aspiration refers to the method by which an internal combustion engine draws in air for combustion solely by utilizing the pressure differential created by the downward movement of the piston during the intake stroke. It relies entirely on the atmospheric pressure, which forces air into the cylinder as the pressure inside the cylinder drops below atmospheric.
* **Concept:** In a naturally aspirated engine, the intake manifold is open to the atmosphere (typically through an air filter). As the piston moves downwards, it increases the volume within the cylinder, thereby creating a partial vacuum. The higher atmospheric pressure outside then pushes air into this lower-pressure region until the cylinder is largely filled.
* **Mechanism:**
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