Abstract
Aircraft piston engines are built with compromise on performance and safety. The desire to achieve the highest power-to-weight ratio leads to the search for solutions that optimize the combustion process. On the other hand, the need for maximum reliability leads to the simplification of the design at the costs of performance. An example of such a compromise is the ignition system of the ASz-62IR engine. In this engine there is a double magneto ignition system with a fixed ignition advance angle. As part of the modernisation of this engine, an electronically controlled dual ignition system was developed, which allows for optimum control of the ignition advance angle in terms of power. This article discusses the results of bench tests of the ASZ-62IR-16X engine with fixed ignition timing and variable timing control. Functional parameters and toxicity of exhaust gases were analyzed.
Highlights
The aviation industry is one of the fastest growing technology sectors [5, 6]
This is achieved by optimizing the combustion process [9], implementing turbocharging [4] or fuel and ignition advance angle control systems [1, 3]
In order to show the level of changes, the percentage difference between the power obtained for an engine with a constant and variable ignition advance – Fig. 4
Summary
The aviation industry is one of the fastest growing technology sectors [5, 6]. Lightweight and ultralight aircraft propelled by piston engines have an increasing share in this industry [5].One of the most important requirements for these power units is to obtain as much power from the weight unit [6]. Design solutions are being developed which allow to increase the power without the necessity to increase the weight of the engine. This is achieved by optimizing the combustion process [9], implementing turbocharging [4] or fuel and ignition advance angle control systems [1, 3]. Another very important factor is the safety and reliability of the design [1]. The engineers are faced with a dilemma: whether to introduce a new solution that increases engine power but at the same time may reduce the reliability of the structure (in the results of more elements, for example)
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