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Home Aerospace & Aeronautics Jet Devices For Quick Cooling And Cryogenic Fuel Components Sludge Obtaining

Jet Devices For Quick Cooling And Cryogenic Fuel Components Sludge Obtaining


Partial evaporation of the liquids in the adiabatic conditions is widely used for large volumes cooling of the cryogenic fuel components in the aerospace engineering. In the jet cooler ( See Fig. 1 ) this process is realized in the flow at the discharge of the boiling liquids from the nozzle with following phase separation in the separator before cooled liquid pressure recovery in the diffuser. Created vapour ( 4…20% of the liquids depend upon cooling value and liquid kind )is retracted into exhaust socket. High flow rate and developed surface of the phase contact provide small device overall dimensions and 400…600 K/s cooling rate at the cooled liquid full pressure losses near 0.01…0.5 MPa. Device mass with flow rate 0.02 м3/s is 5…12 kg. Cooled liquid pressure on the device output is always higher of the saturation pressure. At the pressure reduction on the nozzle exit up to value below triple point it is possible to obtain sludge component flow.

Innovative Aspect and Main Advantages

Jet device small sizes remove а restriction on its placement on the cryogenic systems and repeated using of the highly explosive fuel components, for example, liquid hydrogen. Main advantages of the jet cooler are:

  • overall dimensions and mass are 30…100 times less than surface heat-exchangers;
  • design simplicity and absence of the moving element and sealing places;
  • cooldown losses reduction;
  • resistance head losses at the liquid cooling value growth;
  • possibility of the cooled liquid full pressure in-creasing;
  • steady functioning at the two-phase flow state on the inlet;
  • possibility of the sludge flow obtaining with solid phase size less than 40 microns;
  • possibility of the quick changing of the cryogenic fuel component temperature at the testing of the engines and its elements;
  • increase from 5 to 25 times of the continuous pump testing duration at the one refuelling of the test bench tanks.

Areas of Application

  • Repeated utilization (recirculation) of the 80…96% cryogenic fuel components at the bench tests of the units;
  • Obtaining of the sludge hydrogen flow with full pressure 0.06…0.18 MPa, 30…60% solid phase concentration and 20…60 microns crystall size;
  • Increasing of the fuel supply system cavitation sensitivities;
  • pumped feed of cryogenic fuels at the two-phase state on the inlet;
  • Refueling of the tanks by supercooled or sludge-state cryogenic fuel;
  • Cryogenic tanks thermostating;
  • Cryogenic liquids transport by the lengthy pipelines;
  • Desaturation and cooling of the kerosene before fuel tanks refueling;
  • Quick cooling of the milk and juices at the sterilization.

Jet coolers.

Stage of Development

Jet coolers actual tests were conducted at the liquid oxygen, nitrogen and hydrogen with flow rate 0,2…400 kg/s, nitrogen sludge flow was obtained, milk and juice cooling tests took place.

Contact Details

National Aerospace University "KhAI",
Ilya I. Petukhov
17, Chkalova St., Kharkiv, 61070, Ukraine,
Phone: +380-57-7074435;
Fax: +380- 57-7190475;
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


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