Pulsed detonation engine

A method of operating a pulsed detonation engine comprising:

• providing a pulsed detonation engine comprising:
• a detonation tube configured to receive gaseous fuel and an oxidizer to be detonated therein, wherein the detonation tube comprises a perimeter wall, an upstream end, a downstream end, a longitudinal axis extending from the upstream end to the downstream end, and an axially extended portion extending along the longitudinal axis from the upstream end to the downstream end;
• one or more fuel-oxidizer injectors configured to inject the gaseous fuel and the oxidizer into the detonation tube, wherein the one or more fuel-oxidizer injectors are disposed at the upstream end and the perimeter wall along the axially extended portion of the detonation tube, wherein the one or more fuel-oxidizer injectors defines an array of orifices having a central orifice and a plurality of elongate orifices substantially surrounding the central orifice, wherein the central orifice is defined at the geometric center of the one or more fuel-oxidizer injectors, wherein the central orifice has a central orifice axis perpendicular to the longitudinal axis of the detonation tube, wherein each of the plurality of elongate orifices defines an elliptical shape or an elongated circle shape and has an orifice axis at an acute angle relative to the central orifice axis, wherein the central orifice is configured to inject the gaseous fuel and oxidizer in a radial direction and wherein the elongate orifices are configured to inject the gaseous fuel and oxidizer in a direction having an axial and radial component into the detonation tube;
• and
• an ignition configured to ignite the gaseous fuel and the oxidizer in the detonation tube so as to initiate detonation of the gaseous fuel and the oxidizer;
• injecting the gaseous fuel and the oxidizer into the detonation tube via the one or more injectors;
• and
• igniting the gaseous fuel and the oxidizer in the detonation tube so as to initiate detonation of the gaseous fuel and the oxidizer, wherein the gaseous fuel and the oxidizer are injected into the detonation tube both from the upstream end and along the axially extended portion of the detonation tube.