Gas generator

A Delta IV Heavy during liftoff. The rocket is entirely fuelled with liquid hydrogen and liquid oxygen cryogenic propellants.

Device for generating gas.

- Gas generator

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Gas-generator cycle

Power cycle of a pumped liquid bipropellant rocket engine.

Gas-generator rocket cycle. Some of the fuel and oxidizer is burned separately to power the pumps and then discarded. Most gas-generator engines use the fuel for nozzle cooling.

Part of the unburned propellant is burned in a gas generator (or preburner) and the resulting hot gas is used to power the propellant pumps before being exhausted overboard, and lost.


Vehicle occupant-restraint system using a bag designed to inflate extremely quickly, then quickly deflate during a collision.

The driver and passenger front airbag modules, after having been deployed, in a Peugeot 306
John W. Hetrick's 1953 safety cushion patent drawing
1975 Buick Electra with ACRS
A deployed curtain airbag in a Ford Mondeo
Side airbag inflated permanently for display purposes
Deployed curtain airbag and side torso airbag in a Citroën C4
Deployed passenger knee airbag in a Toyota Tundra after a frontal collision test, the driver-side knee airbag also deployed. Blue and yellow markings indicate the dummy's knees.
Front-center airbag of a Chevrolet Traverse deployed in a static out-of-position test: The purpose of the test was to find out how this airbag affects a 3-year-old child who is out of his seat and in the direct reach of the airbag.
Seat-belt airbag
An ACU from a Geo Storm
Some cars provide the option to turn off the passenger airbag
Post-deployment view of a SEAT Ibiza airbag
Crash test of an underride guard at 30 - 40 kph - the truck platform at head height has been prevented from impacting the windshield.
Lives saved by seat belts and airbags in the United States of America over 10-years
NASA engineers test the Mars Pathfinder airbag landing system on simulated Martian terrain
OH-58D CABS test
Airbag on a motorcycle

Once the requisite threshold has been reached or exceeded, the airbag control unit will trigger the ignition of a gas generator propellant to rapidly inflate a fabric bag.

Industrial gas

Industrial gases are the gaseous materials that are manufactured for use in industry.

A gas regulator attached to a nitrogen cylinder.
Blowing air at a spark
Bubbles of carbon dioxide form a froth on fermenting liquids such as beer
Döbereiner's hydrogen lamp.
Kipp's apparatus
Acetylene flame carbide lamp
Late Victorian Gasogene for producing carbonated water
Distillation column in a cryogenic air separation plant
A nitrogen generator
Membrane nitrogen generator
Compressed hydrogen tube trailer
Photos gas cabinet inventory
Dewar being filled with LIN from storage tank
A cutting torch is used to cut a steel pipe.

As production processes for other gases were developed many more gases came to be sold in cylinders without the need for a gas generator.

Rocketdyne E-1

Liquid propellant rocket engine originally built as a backup design for the Titan I missile.

Turbopumps were powered by a gas generator.


For the firms named Aqua Lung, see Aqua Lung/La Spirotechnique and Aqua Lung America.

Classic twin-hose Cousteau-type aqualung

Gagnan miniaturized and adapted it to gas generators in response to a fuel shortage, which was a consequence of German requisitioning.

Base bleed

System used on some artillery shells to increase range, typically by about 20–35%.

Simplified diagram of a base-bleed artillery shell reducing turbulent vortices
Diagram of a base bleed unit. The top diagram shows the bottom of the shell and the location of the gas vents. The bottom diagram is a cut-away view showing the gas generator mechanism.
XM1128 showing bleed propellant cavity (red)

Instead, a small ring of metal extends just past the base, and the area in the rear of the shell is filled with a small gas generator.

Black Arrow

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A mockup of the Black Arrow in the rocket park at Woomera.
Cutaway diagram, showing the positions of fuel and oxidiser tanks, engines, and the third stage inside the fairing.
The first two stages and open payload fairing of R4 on display at the Science Museum in London
The colour scheme used on all flights except R0, with stripes on the first stage for determining roll angle, and a coloured fairing to increase visibility.
Black Arrow R4 on display in the Science Museum, with the stages and fairing separated, and the flight spare of the Prospero satellite
The first stage of Black Arrow R3, on display at William Creek following its return to Earth

Just over a minute after the third stage had burned out, the payload was released, and gas generators were used to push the spacecraft and spent upper stage apart.

Rolls-Royce Olympus

The world's second two-spool axial-flow turbojet aircraft engine design, first run in May 1950 and preceded only by the Pratt & Whitney J57, first-run in January 1950.

Preserved Bristol Siddeley Olympus Mk 301 Engine Change Unit (ECU) complete with ancillaries and bulkheads.
Gas-flow diagram of Olympus Mk 101

By the end of 1946, the company had only 10 hours of turbojet experience with a small experimental engine called the Phoebus which was the gas generator or core of the Proteus turboprop then in development.

Europrop TP400

11,000 shp powerplant, developed and produced by Europrop International for the Airbus A400M Atlas military transport aircraft.

TP400 presented by Safran at the 2017 Paris Air Show.
Two TP400 engines on the port wing of an Airbus A400M Atlas at the 2018 ILA Berlin Air Show. With the image zoomed in, the LH or RH markers become visible on the propeller blades, indicating that the blades are for the left-handed and right-handed propeller, respectively.
Two TP400 engines on the starboard wing of an A400M test aircraft in 2010. Notice the chin air intakes below the propeller hubs.
The TP400 main propeller gearbox on display at the 2013 Paris Air Show.
A closeup of the highly swept Ratier-Figeac propellers.

The TP400 has a three-shaft configuration, consisting of a two-shaft gas generator followed by a free-power turbine.

Model rocket motor classification

Total impulse in newton seconds.

A large force applied for a very short duration, such as a golf shot, is often described as the club giving the ball an impulse.

In this example, the letter (C) represents the total impulse range of the motor, the number (6) before the dash represents the average thrust in newtons, and the number (3) after the dash represents the delay in seconds from propelling charge burnout to the firing of the ejection charge (a gas generator composition, usually black powder, designed to deploy the recovery system).