Patent ID: 8607543
Filing Date: 2013-12-17
Classification: F02K,F05D

Abstract:
1. A millimeter-scale pulse jet engine, comprising: an engine body having dimensions from 0.001 mm to 10 mm; a combustion chamber; a fuel inlet arranged to inject fuel directly into the combustion chamber; an air intake; and an exhaust, wherein a portion of the air intake proximal a mouth of the combustion chamber is arranged at substantially 90° with respect to the mouth of the combustion chamber, wherein the air intake and the exhaust are in fluid communication with the combustion chamber so that the air intake delivers flow into the mouth of the combustion chamber and the exhaust receives flow from the mouth of the combustion chamber; and the combustion chamber is configured such that air from the air intake and fuel from the fuel inlet cyclically combust in the combustion chamber to produce exhaust gases wherein the combustion chamber is shaped for directing exhaust gases through the exhaust and wherein the exhaust, air intake and combustion chamber are configured such that at least some exhaust gases are biased back toward the combustion chamber during a part of the combustion cycle; wherein the at least some of the exhaust gases are at an elevated temperature and heat fuel from the fuel inlet and air from the air intake so as to provide re-ignition within the combustion chamber in the next combustion cycle.