Details page | Paper / Information search system

Search

Search help

Summary & Details

The Flathead Valved Boosted Uniflow Two Stroke Engine

Delivery: Available on this site

Format: PDF

Price: Non-members (tax incl.)：￥1,100 Members (tax incl.)：￥880

Publication code: 20239526

Paper/Info type: SETC

No.2023-01-1826

Pages: 1-13(Total 13 p)

Date of publication: Oct 2023

Publisher: JSAE & SAE

Language: English

Event: Small Powertrains and Energy Systems Technology Conference 2023

Detailed Information

Author(E)	1) Roberto Begnis Hausen, 2) Mario Martins, 3) Juliano silveira, 4) Jean Lucca Fagundez PhD
Affiliation(E)	1) Federal University of Santa Maria, 2) Federal University of Santa Maria, 3) Federal University of Santa Maria, 4) Federal University of Santa Maria
Abstract(E)	Experimental aviation engines face numerous challenges, including the need for energy efficiency, alternative fuel sources, reduced weight and size, greater durability with reliability, emissions reduction, and integration with advanced control and monitoring systems. This study presents the performance of a two-stroke engine with a Uniflow scavenging system with a flathead valve concept, with lower specific fuel consumption than conventional two-stroke aircraft engines. The engine’s maximum speed is limited to 3000 rpm for better cylinder scavenging efficiency, which also eliminates the need for a reduction gearbox, simplifies the design, and reduces the engine’s total mass. 1D simulations were conducted to evaluate combustion and performance parameters using aviation. At the maximum speed of 3000 rpm, the engine achieved a power of approximately 23 kW with boost around 3bar, while at cruise speeds between 2400 and 2700 rpm, the maximum torque is approximately 80 Nm, with specific fuel consumption ranging from 368 to 378 g/kWh. Brake fuel efficiency is around 23%, which is significantly higher than that of conventional two-stroke engines with cross-flow scavenging, with an average efficiency of only 19%. 3D simulations (CFD) showed promising results with swirl and tumble presenting high velocities promoting high turbulence in the combustion chamber. The engine’s high-power density of approximately 90 kW/l makes it a suitable option for equipping experimental aircraft, as it is compact, efficient, and lightweight compared to commercially available options.

About search

How to use the search box

You can enter up to 5 search conditions. The number of search boxes can be increased or decreased with the "+" and "-" buttons on the right.

If you enter multiple words separated by spaces in one search box, the data that "contains all" of the entered words will be searched (AND search).

Example) X (space) Y → "X and Y (including)"

How to use "AND" and "OR" pull-down

If "AND" is specified, the "contains both" data of the phrase entered in the previous and next search boxes will be searched. If you specify "OR", the data that "contains" any of the words entered in the search boxes before and after is searched.

Example) X AND Y → "X and Y (including)" X OR Z → "X or Z (including)"

If AND and OR searches are mixed, OR search has priority.

Example) X AND Y OR Z → X AND (Y OR Z)

If AND search and multiple OR search are mixed, OR search has priority.

Example) W AND X OR Y OR Z → W AND (X OR Y OR Z)

How to use the search filters

Use the "search filters" when you want to narrow down the search results, such as when there are too many search results. If you check each item, the search results will be narrowed down to only the data that includes that item.

The number in "()" after each item is the number of data that includes that item.

Search tips

When searching by author name, enter the first and last name separated by a space, such as "Taro Jidosha".