WO2018055612A1 - Système de propulsion - Google Patents

Système de propulsion Download PDF

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Publication number
WO2018055612A1
WO2018055612A1 PCT/IL2017/051056 IL2017051056W WO2018055612A1 WO 2018055612 A1 WO2018055612 A1 WO 2018055612A1 IL 2017051056 W IL2017051056 W IL 2017051056W WO 2018055612 A1 WO2018055612 A1 WO 2018055612A1
Authority
WO
WIPO (PCT)
Prior art keywords
section
tubing
propulsion system
liquid
pump
Prior art date
Application number
PCT/IL2017/051056
Other languages
English (en)
Inventor
Azriel Lorber
Original Assignee
Daphnemed Agencies Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daphnemed Agencies Ltd filed Critical Daphnemed Agencies Ltd
Publication of WO2018055612A1 publication Critical patent/WO2018055612A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03H99/00—Subject matter not provided for in other groups of this subclass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/40—Arrangements or adaptations of propulsion systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/40—Arrangements or adaptations of propulsion systems
    • B64G1/409—Unconventional spacecraft propulsion systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/24—Guiding or controlling apparatus, e.g. for attitude control
    • B64G1/28—Guiding or controlling apparatus, e.g. for attitude control using inertia or gyro effect

Definitions

  • the invention is in the field of space travel. Specifically the invention relates to systems used to propel spacecrafts and other objects in space.
  • Deep space travel has long been limited by the propulsion systems used therefor.
  • the first type is used for overcoming gravitational forces. Taking off from the surface and leaving earth's atmosphere are examples of space travel stages which require a propulsion system of the first type.
  • the second type is used for maneuvering a space vehicle in an environment lacking significant gravitational forces, i.e. in outer space. Adjusting a space vehicle's trajectory and velocity while in outer space are examples of space travel stages which require a propulsion system of the second type.
  • the present invention relates to a system of the second type.
  • the most widely used method of spacecraft propulsion relies on chemical combustion rockets. This method is limited by the amount of fuel that a spacecraft can carry. Thus spacecraft are accelerated to the desired speed and then coast to their targets. If designed to land on another celestial body, a similar amount of fuel will be required for deceleration.
  • ion thrusters Another type of propulsion system is ion thrusters, which create propulsion force by expelling ions through a nozzle 180 degrees from the intended direction of motion.
  • ISP specific impulse
  • ion thruster systems are relatively high compared to advanced chemical rockets (in the order of a few thousands for ion thrusters, compared to 450 for chemical rockets), the absolute forces these systems produce are minute, in the order of a few milli-Newtons.
  • ion thrusters also require some form of consumables to produce ions.
  • US 2,886,976 describes a propulsion system, a "Dean Drive", which attempts to convert, by mechanical means, centrifugal motion into a unidirectional force. This system, however, was never properly demonstrated as able to provide a propulsive force in free space.
  • the invention relates to a propulsion system attached to a space vehicle for propelling the space vehicle in an essentially gravity free environment, the system comprising:
  • the shapes of the first and/or second section of tubing can be chosen from a list, comprising; a circle, a semi-circle, an ellipse and a rectangle.
  • the first or second section is straight.
  • reaction forces developed from the pump of a first system are cancelled out by placing a second identical system with the liquid circulating in the opposite direction side by side with the first system.
  • the propulsion system is configured so that the propulsion system can be stopped and restarted at will.
  • the propulsion system is mounted in so that it can be rotated in order to provide force in any desired direction. For instance, the propulsion system can be configured to be rotated 180° from an initial direction in which the vehicle is moving, in order to provide a braking force.
  • the liquid used in the propulsion system according to the invention can be of any suitable type. According to an embodiment of the invention the liquid is selected from water, mercury, alcohol, liquid metal and sodium.
  • FIG. 2 schematically illustrates a propulsion system according to another embodiment of the present invention.
  • the present invention relates to a system and method for obtaining vehicle propulsion based on the control and manipulation of a device producing a centrifugal force within the vehicle, and converting this force into a directional one.
  • the system is based on the use of electric motors to supply the energy, thus it is assumed that sufficient electric power can be available, e.g. produced by solar panels attached to the propelled vehicle or a nuclear power plant.
  • Fig. 1 schematically illustrates a propulsion system according to an embodiment of the present invention.
  • directions are marked in Fig. 1 as north and south.
  • the system comprises a toroidal tube 101 with two sections, the first of which having a significantly larger cross section than the second.
  • Toroidal tube 101 comprises a first section 102 having a relatively larger cross section, at the southern region of the tube, and a second section 103 having a smaller cross section, at the northern region.
  • the radius of tube 101 with respect to section 103 is marked R.
  • the two sections, i.e. 102 and 103, are connected by two transition sections 108 and 109.
  • the tube contains an essentially non-compressible liquid, e.g. water, alcohol, mercury or a liquid metal, such as Sodium, denoted in Fig. 1 by wave-like arrows
  • the increase in velocity of the liquid occurs in transition section 108, and is equal to the ratio between the cross sectional areas of sections 102 and 103.
  • the ratio between the mass of the liquid in section 102 and the mass of the liquid in section 103 is also equal to the ratio between the cross sectional areas of sections 102 and 103.
  • V s is the velocity of liquid passing through southern section 102
  • V n is the velocity of liquid passing through northern section 103
  • M n is the mass of the liquid in a given length of tube in the northern section 103
  • M s is the mass of the liquid in the same length of tube the in southern section 102
  • S s is the cross sectional area of section 102
  • 5 bias is the cross sectional area of section 103.
  • a control length of mass M s from section 102 of the tube speeds up by a factor of K when entering the section 103 of the tube.
  • the mass M n of the same control length in section 103 will be equal to 1/K times the mass M s in section 102.
  • the velocity V n of the mass in section 103 will be V s * K, compared to its velocity V s in section 102.
  • the centrifugal forces in the northern region have a value defined by Eq. 3 obtained by combining Eq. 1 and Eq. 2, wherein f s is the centrifugal force acting on section 102, and f n is the centrifugal force acting on section 103.
  • the magnitude of the directional force is determined by the dimensions and characteristics of the system, e.g. the radius R of tube 101, the cross section areas of sections 102 and 103, the mass of the liquid 104, and the flow rate of circulation pump 105, as is expressed in Eq. 8, which is derived using the above equations 2, 5, and 7.
  • Fig. 2 schematically illustrates a propulsion system according to another embodiment of the present invention.
  • the system comprises a semi-toroidal tube 201, with a straight first section 202 in the southern region of the tube and an arched second section 203 in the northern region of the tube.
  • the two sections, i.e. 202 and 203, are connected by two transition sections 208 and 209.
  • the tube contains an essentially non-compressible liquid, e.g. water, alcohol, mercury or a liquid metal such as Sodium, denoted in Fig. 2 by wave-like arrows 204, and a pump 205 situated within section 202 of the tube.
  • an essentially non-compressible liquid e.g. water, alcohol, mercury or a liquid metal such as Sodium
  • the southern region develops no centrifugal force, therefore the direction of the net force produced by the system is directed north, with respect to the system. Because the southern region develops no centrifugal force theoretically the diameters of the two sections of tube could be the same, but the system is much more efficient if the straight section has a larger cross-sectional area.
  • reaction forces develop from the action of the pump.
  • two systems as described above can be assembled side by side, each with opposite liquid flow directions, i.e. different orientation of the pump.
  • the general shape of a propulsion system is elliptical, rectangular or of any other polygon sufficient for producing force in a predefined direction, depending on propulsion requirements.
  • the particular liquid used in any embodiment of the invention is chosen according to standard engineering practices such as efficiency, complexity, cost and safety of operation.
  • a numerical example for the second embodiment will now be provided for sake of demonstrating the invention. Sizes and quantities in this example are according to a specific embodiment of the present invention, and are not meant to be limiting in any way. It is obvious that other sizes and quantities can be used depending on the circumstances of a particular application of the invention.
  • the above calculation doesn't take into consideration the initial velocity given by the launch rocket or the additional deceleration needed at Mars due to the initial velocity before the system of the invention is activated.
  • Both embodiments of the propulsion system that are described herein can be stopped and restarted at will. They can also be mounted in a gimbal system so that they can be rotated in order to provide force in any desired direction, including 180° from the initial position, to provide a braking force when so desired.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Control Of Linear Motors (AREA)
  • Control Of Position Or Direction (AREA)
  • Control Of Position, Course, Altitude, Or Attitude Of Moving Bodies (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

L'invention concerne un système de propulsion fixé à un véhicule spatial afin de le propulser dans un environnement sensiblement exempt de gravité. Ce systéme comprend : a) une première section de tube; b) une seconde section de tube ayant une aire de section transversale significativement supérieure à celle de la première section de tube; c) deux sections de transition qui relient les extrémités de la première section de tube aux extrémités de la seconde section de tube; d) une pompe de circulation située dans la deuxième section et dont le débit peut être commandé; et e) un liquide essentiellement non compressible forcé par la pompe à circuler en continu à l'intérieur de la section de tube.
PCT/IL2017/051056 2016-09-21 2017-09-19 Système de propulsion WO2018055612A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL247953 2016-09-21
IL247953A IL247953B2 (en) 2016-09-21 2016-09-21 Push system

Publications (1)

Publication Number Publication Date
WO2018055612A1 true WO2018055612A1 (fr) 2018-03-29

Family

ID=57907537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IL2017/051056 WO2018055612A1 (fr) 2016-09-21 2017-09-19 Système de propulsion

Country Status (2)

Country Link
IL (1) IL247953B2 (fr)
WO (1) WO2018055612A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798427A1 (fr) * 1999-09-09 2001-03-16 Alexis Defarge Propulseur a centrifugation interne excentree

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2798427A1 (fr) * 1999-09-09 2001-03-16 Alexis Defarge Propulseur a centrifugation interne excentree

Also Published As

Publication number Publication date
IL247953A0 (en) 2017-01-31
IL247953B2 (en) 2023-07-01
IL247953B1 (en) 2023-03-01

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