e/Shchelkin spiral

Information
has gloss	eng: The Shchelkin spiral is a device that assists the transition from deflagration (subsonic combustion) to detonation in a pulse detonation engine. The spiral is named after Kirill Ivanovich Shchelkin, a Russian physicist who described it in his 1965 book Gas Dynamics of Combustion.
lexicalization	eng: Shchelkin spiral
instance of	c/Ignition systems