Method of generating a high-speed airflow

A method of generating a high-speed gas flow, characterized by utilizing a device comprising an gas pipe, a circulating pipe, and a starting and controlling system,

• wherein the starting and controlling system comprises one or more of a refrigerator, a circulating pump, or a heat exchanger;
• wherein the gas pipe makes a working medium in gaseous state be condensed into liquid state and be guided into the circulating pipe by necking the gas pipe to vary the diameter thereof or by additionally providing a gas-liquid separation device and a flow guiding device;
• wherein the working medium is anew circulated to enter the gas pipe after absorbing heat by passing through the starting and controlling system;
• and wherein the method comprises:
• filling the device with the working medium;
• activating the starting and controlling system;
• and
• after having been pressurized under liquid state, the working medium absorbing heat and being gasified, and entering the gas pipe, to generate the high-speed gas flow.