US2332694A - Air venturi - Google Patents

Air venturi Download PDF

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Publication number
US2332694A
US2332694A US464145A US46414542A US2332694A US 2332694 A US2332694 A US 2332694A US 464145 A US464145 A US 464145A US 46414542 A US46414542 A US 46414542A US 2332694 A US2332694 A US 2332694A
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venturi
air
throat
depression
air venturi
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US464145A
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John F Campbell
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00—Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00—Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/43—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel
    • F02M2700/4302—Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit
    • F02M2700/4392—Conduits, manifolds, as far as heating and cooling if not concerned; Arrangements for removing condensed fuel

Definitions

  • the object of this invention is to obtain a triie pressure corresponding. to a fair average of the velocity ⁇ of the air entering the carburetor.
  • the ordinary engines in use in ⁇ the air are radial and is it necessary for the carburetor to be mounted immediately to the rear of the engine and to draw its air in immedi ately from the top of the engine and the entrance to the venturi is located immediately behind the propeller.
  • Fig. 1 shows a cross sectional plan view taken o n plane I-I of F18. 2.
  • Fig. 2 shows a cross sectional elevation taken of piane 2-2 of Fig. l.
  • Fig. 3 shows on smaller scale the arrangement of the venturi in the air entrance to airplane engine.
  • the two walls of the venturi A and B are curved so. as to form a Venturi throat.
  • turi and arranged in line along the long axis of said larger venturi.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Sampling And Sample Adjustment (AREA)

Description

AIR VENTURI Filed oct. 51, 1942 INVENIOR.
Patented Oct. .26, l1943 AIR VENTURI John F. Campbell, Detroit, Mich., assigner tt George M. Holley and Earl Holley Application October 31, 1942, Serial No. 464,145
1 Claim. The object of this invention is to obtain a triie pressure corresponding. to a fair average of the velocity` of the air entering the carburetor.
It is and has been for about '30 years the practice to use a double venturi. The smaller one 'of the two discharges into the throat of the larger one. The depression in the throat of thesmaller venturi is thus greater than the depression in the throat of the larger and is used as a measure of the flow of air. So long as the carburetor does not exceed 100 horse power, this methodis very satisfactory. When the capacity of the carburetor exceeds 2000 horse power, for example. this means is inadequate. Furthermore, the dimensions of the venturi become unmanageable. These carburetos have to be fitted in the fuselage of an ordinary airplane. The ordinary engines in use in `the air are radial and is it necessary for the carburetor to be mounted immediately to the rear of the engine and to draw its air in immedi ately from the top of the engine and the entrance to the venturi is located immediately behind the propeller.
I have discovered` that if I make the venturi rectangular and have the longer side many times the shorter side, that is if I have a long narrow venturi, I can shorten the length of the venturi. I can also make the necessary 90 degrees turn easier. However, I discovered that with a long narrow venturi, the airilow in various parts of the venturi varies greatly because the air behind the propeller is greatly disturbed and the mere fact that the air makes a 90 degree turn immediately before entering the throat of the venturi is itselfv a cause of eddies, hence the depression in one part of the venturi will be quite different from the depression in another part of the venturi. The problem was how to sample the air ilowing through the venturi so as to get a, true reading oi' the average airflow.
Fig. 1 shows a cross sectional plan view taken o n plane I-I of F18. 2.
Fig. 2 shows a cross sectional elevation taken of piane 2-2 of Fig. l.
Fig. 3 shows on smaller scale the arrangement of the venturi in the air entrance to airplane engine. l
In the iigures, the two walls of the venturi A and B are curved so. as to form a Venturi throat.
lInto this throat there discharges a venturi of smaller size formed by two walls which 'are letwhich is the sampling tube used for determiningg v the fiow'of air through the venturi.
Operation During the operation of the plane in flight,
the eddies in the air entrance cause variations in the velocity of ow through the small throats formed by the partitions Cil-G1, hence a fair avy erage depression is created in the tube E..
turi and arranged in line along the long axis of said larger venturi. a plurality ofpartitions in the throat of the smaller venturi, means forming a common passage having independent connections with the individual spaces formed by said partitions in said smaller venturi.
JOHN F. CAMPBELL.
US464145A 1942-10-31 1942-10-31 Air venturi Expired - Lifetime US2332694A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871670A (en) * 1953-04-20 1959-02-03 North American Aviation Inc Process of liquefied gas pumping
US2938464A (en) * 1957-07-02 1960-05-31 Nielsen Mfg Co Air charger
US2994218A (en) * 1954-12-17 1961-08-01 Frenzl Otto Apparatus for checking the flow areas of nozzles, distributor wheels or the like
US3520639A (en) * 1968-08-21 1970-07-14 Brittain Ind Inc Venturi tube
US4594888A (en) * 1985-02-19 1986-06-17 Air Monitor Corporation Airflow measuring sound attenuator
US6899081B2 (en) 2002-09-20 2005-05-31 Visteon Global Technologies, Inc. Flow conditioning device

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2871670A (en) * 1953-04-20 1959-02-03 North American Aviation Inc Process of liquefied gas pumping
US2994218A (en) * 1954-12-17 1961-08-01 Frenzl Otto Apparatus for checking the flow areas of nozzles, distributor wheels or the like
US2938464A (en) * 1957-07-02 1960-05-31 Nielsen Mfg Co Air charger
US3520639A (en) * 1968-08-21 1970-07-14 Brittain Ind Inc Venturi tube
US4594888A (en) * 1985-02-19 1986-06-17 Air Monitor Corporation Airflow measuring sound attenuator
US6899081B2 (en) 2002-09-20 2005-05-31 Visteon Global Technologies, Inc. Flow conditioning device

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