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Title of the article THE CONCEPT OF A HYBRID COOLING SYSTEM FOR A SPARK-IGNITION TWO-STROKE ENGINE FOR UAV
Authors

KOCHETOV Nikolay V., Ph. D. in Eng., Assoc. Prof., M. Sc. in Economics, Leading Researcher of the Research Department, JSC “Instrument-Making Plant Optron”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

PADAROZHNIAYA Iryna V., M. Sc. in Eng., Researcher of the Research Department, JSC “Instrument-Making Plant Optron”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

MIRANOVICH Oleh L., Ph. D. in Eng., Assoc. Prof., Head of Research Department, JSC “Instrument-Making Plant Optron”, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.
In the section GENERAL ISSUES OF MECHANICS
Year 2025
Issue 4(73)
Pages 12–17
Type of article RAR
Index UDK 623.746
DOI https://doi.org/10.46864/1995-0470-2025-4-73-12-17
Abstract The process of improving two-stroke engines for unmanned aerial vehicles (UAV) is considered. The cooling system and methods of effective heat removal are analyzed in detail. Traditionally, two-stroke engines use air cooling, which subsequently dissipates excess heat into the environment through the airflow. Such internal combustion engines are relatively simple, lightweight, and cheap. More powerful car engines have a more complex cooling system. Liquid cooling is used here with the use of a heatsink. This makes it possible to significantly increase the area of excess heat dissipation into the environment, the airflow. To increase the airflow, a special fan is turned on. Aircraft engines face a technical contradiction: a powerful engine is needed, but the use of water cooling significantly increases the weight of the aircraft. Some foreign firms, such as Hirth in Germany, offer liquid-cooled engines for medium power. But they are are not widespread. The authors offer a combination of air and liquid cooling. The main heat dissipation is carried out by a blown air stream. If the engine temperature rises above the critical value, rapid heat removal is carried out by liquid cooling through water evaporation. Vaporization requires a lot of heat, which is discharged into the environment with the steam generated. The use of the endothermic phenomenon in vaporization formed the basis of the proposed type of cooling of the UAV engine. During the transition from one state of aggregation (water into steam), the temperature of the substance practically does not change. This makes it possible to stabilize the temperature regime of the engine.
Keywords UAV, heat dissipation, liquid cooling, endothermic phenomenon, two-stroke engine
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