Development of Large Diameter Detonation Wave Initiator Using Cylindrical Detonation Wave

2014 Fiscal Year Final Research Report

• Project/Area Number: 25870006
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Aerospace engineering; Thermal engineering
• Research Institution: Hokkaido University
• Principal Investigator: WAKITA Masashi 北海道大学, 工学(系)研究科(研究院), 助教 (80451441)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: パルスデトネーションエンジン / デトネーション / イニシエーション

Outline of Final Research Achievements

To derive universal rules for large diameter detonation initiation in our enhanced reflection type large bore PDE initiator, the propagation limit of a diverging cylindrical detonation wave, and the necessary condition for transition from a cylindrical wave to a toroidal detonation wave were investigated in this research. The main results of this research are as follows: 1) the propagation limit of the cylindrical wave depends on the ratio of wave curvature to detonation cell size, and the threshold value of this ratio is 1/16, 2) the necessary condition for a successful transition from cylindrical to toroidal detonation is to make the toroidal path width less than half of the cylindrical path width, and to make the cylindrical path width wider than about four times that of the detonation cell size.

Free Research Field

燃焼工学