Fabrication of Air Engine
DOI:
https://doi.org/10.15662/IJEETR.2026.0802462Keywords:
Air Engine, Compressed Air Technology, Pneumatic System, Thermodynamics, Mechanical Fabrication, Energy Conversion, Chain Drive MechanismAbstract
An air engine is a pneumatic device that converts the energy of compressed air into useful mechanical work without combustion. It operates on the principle of expansion of compressed air, making it an environmentally friendly alternative to traditional engines. The fabrication of an air engine involves systematic design, material selection, machining, assembly, and testing processes based on concepts from Mechanical Engineering and Thermodynamics.
The fabrication process begins with the design phase, where detailed drawings and dimensions of components such as the cylinder, piston, crankshaft, connecting rod, air inlet and exhaust valves, and frame are prepared. Proper design ensures efficient air flow, minimal leakage, and smooth motion transfer. Materials like mild steel, aluminum, and cast iron are selected depending on strength, weight, cost, and machinability.
Manufacturing of individual components is carried out using conventional machining processes such as turning, milling, drilling, shaping, and grinding. The cylinder is finished with high precision to reduce friction and air leakage, while the piston is designed to fit accurately within the cylinder. The crankshaft and connecting rod are fabricated to withstand dynamic loads and ensure effective conversion of reciprocating motion into rotary motion.
Assembly is a critical stage where all components are fitted together with proper alignment. Bearings, seals, and gaskets are used to reduce friction and prevent air leakage. The compressed air supply system is connected through control valves that regulate the entry and exit of air inside the cylinder. When compressed air enters the cylinder, it pushes the piston, creating reciprocating motion. This motion is transmitted to the crankshaft, producing rotary output.
After assembly, the air engine is tested for performance, efficiency, and leakage. Adjustments are made to improve sealing, alignment, and air flow. Lubrication is provided to reduce wear and enhance durability. The overall system is evaluated based on speed, torque, and operational smoothness.
The fabricated air engine demonstrates the practical application of pneumatic systems and energy conversion principles. It offers advantages such as low pollution, simple construction, low maintenance, and safe operation. However, limitations such as lower efficiency compared to internal combustion engines and dependency on compressed air supply exist.
This project highlights the potential of air engines in small-scale applications and as a sustainable alternative for future energy systems.
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