WO2008017916A2 - Système de propulsion nautique pour navigation en surface et/ou sous l'eau - Google Patents

Système de propulsion nautique pour navigation en surface et/ou sous l'eau Download PDF

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Publication number
WO2008017916A2
WO2008017916A2 PCT/IB2007/002216 IB2007002216W WO2008017916A2 WO 2008017916 A2 WO2008017916 A2 WO 2008017916A2 IB 2007002216 W IB2007002216 W IB 2007002216W WO 2008017916 A2 WO2008017916 A2 WO 2008017916A2
Authority
WO
WIPO (PCT)
Prior art keywords
propulsion system
system apparatus
flow
nautical
duct
Prior art date
Application number
PCT/IB2007/002216
Other languages
English (en)
Other versions
WO2008017916A3 (fr
Inventor
Leonardo Valentini
Original Assignee
Calzoni S.R.L.
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 Calzoni S.R.L. filed Critical Calzoni S.R.L.
Publication of WO2008017916A2 publication Critical patent/WO2008017916A2/fr
Publication of WO2008017916A3 publication Critical patent/WO2008017916A3/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H1/00—Propulsive elements directly acting on water
    • B63H1/30—Propulsive elements directly acting on water of non-rotary type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps

Definitions

  • the present invention relates to a nautical propulsion system for surface and/or underwater navigation.
  • the invention relates to a propulsion system of said type, with the direction of the primary flow at a right angle to the direction of the induced secondary flow, having a thrust which can be angled through 360° in the azimuth plane for surface and/or underwater navigation.
  • the aim of the present invention is therefore to provide a nautical propulsion system which allows the above-mentioned disadvantages to be completely or partly overcome.
  • the water delivery flow rate for the pumps consists only of a fraction of the flow rate coming out of the diffuser, due to the significant amplification effect between the two flows.
  • propulsion is characterised by the absence of vorticose washes and the lack of cavitation phenomena, with low acoustic signature.
  • the propulsive thrust may be angled between 0° and 360° in the azimuth plane, making the boat highly manoeuvrable even without rudders.
  • the present invention relates to a nautical propulsion system for surface and underwater navigation, comprising a unit for feeding a delivery or primary flow which comprises an internal combustion engine, a pump driven by the internal combustion engine, and which sucks the fluid directly from the propulsion system by means of an intake through a rotary joint positioned on a foot of the nautical propulsion system.
  • the thrust force is generated by the delivery or primary flow, having a flow rate which is a fraction of the flow coming out of the nautical propulsion system, the delivery flow inflow duct being able to rotate along a 360° arc in the azimuth plane perpendicular to the nautical propulsion system thrust axis.
  • said internal combustion engine is preferably a diesel engine or a turbine engine.
  • the intake is an annular water intake, in particular downstream of the infeed edge for the fluid current which passes through the propulsion system.
  • the intake flow passage is coaxial with the primary flow inflow passage. Also according to the invention, there are, in series, along the duct between the pump and the propulsion system, a hydraulic accumulator with floating piston, a valve with modulating opening, and an elastic joint device for damping the oscillation of the fluid passing through.
  • the system for primary flow inflow is regulated by a sliding shutter, the shutter sliding axially between two positions, respectively close to the infeed edge and close to the throat of the duct for the passage of the propulsive thrust.
  • the inflow angle through the sliding shutter in the position close to the infeed edge varies between 90° and 20°, preferably between 70° and 30°, and even more preferably 45°.
  • the inflow angle through the sliding shutter in the position close to the throat section of the propulsion system varies between 50° and 10°, preferably between 40° and 20°, in particular 30°.
  • the movement of the shutter which slides axially between two positions is obtained by means of two actuator pistons connected to a disk cam which transmit the motion to the shutter through a closed hydraulic circuit.
  • the diffuser has a cone angle of between 4° and 30°, preferably equal to 10°.
  • the diffusion cone from the throat section towards the outfeed edge has Riblet surface working, consisting of a plurality of small axial channels separated by small radial grooves, which promote the adherence of the boundary layer of the flow passing through.
  • the surface of the propulsion system diffuser skirt has a configuration with micro- holes in it.
  • Figure 1 is a schematic view of an embodiment of the nautical propulsion system apparatus in accordance with the invention
  • Figure 2 shows a detail of the propulsion system apparatus of Figure 1;
  • Figure 2a is an enlarged cross-section of a portion of the detail from Figure 2; and
  • Figure 3 shows a second embodiment of the detail from Figure 2.
  • Figure 1 is a schematic overview of the nautical propulsion system apparatus
  • propulsion system body 101 comprising a propulsion system body 101 and a unit 1 for feeding a delivery or primary flow to the propulsion system body 101.
  • the feed unit 1 comprises an engine 2 which drives the axial rotation of a pump 3 which sucks water directly from the propulsion system body 101 through the annular intake 4, by means of the rotary hydraulic joint 5.
  • the engine 2 is a diesel internal combustion engine but, in alternative embodiments not illustrated, without departing from the scope of the inventive concept, the engine 2 may be a turbine internal combustion engine or an electric motor.
  • the pump 3 delivery flow, indicated in Figure 1 with arrows Fl, passes through a filter 6 which serves the dual purpose of filter, to avoid any blockages in the circuit, and acoustic insulation element.
  • the apparatus 100 also comprises an accumulator device 7 positioned downstream of the filter 6 relative to the direction of flow Fl, the accumulator device 7 acts as a damper, levelling out pressure peaks, varying the stroke A of the floating piston 102, based on the counter-pressure Pk in a pressure chamber 103 filled with nitrogen.
  • the unit 1 is suspended by an apparatus, not illustrated, with elastic joints, rubber supports and steel springs, so that the system impedance prevents resonance.
  • the delivery flow Fl enters a chamber 8 in which there is a pin 9 which, with a modulated stroke along its longitudinal axis, regulates the flow rate Qm at the pressure Pm.
  • the delivery flow Fl passes through a special chamber 10, having one wall consisting of an elastic membrane integral with the core 11 on which the pulsing electromagnetic force of a solenoid 104 acts.
  • the solenoid 104 is driven, by a computerised control unit 105, with opposite timing to that of the vibrations emitted by the propulsion system body 101 at the outfeed end U and detected by an acoustic sensor 12, cancelling out the amplitude of vibration. Longitudinally opposite the outfeed end U, the propulsion system body
  • An elastic joint 13 guarantees that the propulsion system is isolated from the downstream devices.
  • a curved connecting element 106 Downstream of the elastic joint 13 there is a curved connecting element 106 at the end of which there is a rotary joint 14 for connecting the curved element 106 and a straight duct 107, extending longitudinally according to a substantially vertical axis X.
  • the stretch of straight duct 107 is connected to the propulsion system body 101 and is integral with it.
  • the rotary joint 14 allows the propulsion system body 101 to rotate about the axis X through an angle ⁇ (from 0° to 360°), the angle and the rotation of the body 101 providing the direction of navigation.
  • the rotation is driven by the motor 15 by means of gears 16 and 17, of which the wheel 16 is integral with the motor 15 whilst the wheel 17 is integral with the straight duct 107.
  • Figure 2 shows a first embodiment with variable geometry of the propulsion system body 101, in which the delivery flow Fl, or inductor primary flow, enters the propulsion system body 101 whose parts labelled 101a, 101b, 101c and lOle are fixed, whilst the shutter 101d can be moved by a hydraulic device 18, between two limit positions Cl and C2, depending on the speed of navigation.
  • the movement of the shutter 101d which slides between its two positions Cl, C2 is obtained by means of two actuator pistons Dl, D2 connected to a disk cam D3 which transmit the motion to the shutter 101d through a closed hydraulic circuit.
  • the shutter 101d can move between the forward position Cl, illustrated in the lower section of the body 101, and the back position C2, illustrated in the upper section of the propulsion system body 101.
  • Figure 2 therefore illustrates in a single drawing, for the sake of simplicity, two different shutter 101d positions.
  • the port 01 With the shutter 101d in the position C2, the port 01 is open and the delivery flow Fl inflow is into an annular area of the body 101, at an angle ⁇ to the axis CL of the propulsion system body 101.
  • the delivery flow Fl enters partly at the angle a. and partly at the angle ⁇ , with a hydrodynamic behaviour equivalent to that of a delivery flow Fl at an intermediate angle ⁇ between Oi and ⁇ .
  • the angle ⁇ is therefore defined as ⁇ ⁇ ⁇ .
  • the optimum shutter 101d position is determined by the instantaneous value of the navigation speed V n .
  • the delivery flow Fl is positioned in such a way that it is adherent to the wall, applying a pulling action for the rest of the fluid current in the throat area ⁇ g.
  • the vacuum zone -P induced by the primary flow draws the induced secondary flow Qe at the speed Ve.
  • the diverging duct 108 is set at an angle ⁇ to CL and constitutes a diffuser duct for the total flow (flow rate of the delivery flow Qm + flow rate of the induced flow Qe) at outfeed at the speed Vu at the pressure +P which generates the propulsive thrust Nw.
  • Figure 2a which shows, in a cross-section according to a plane transversal to the axis CL, a portion of the inner skirt 109, at the end part 10 Ie of the body 101, the skirt 109 has ribbing formed by a plurality of longitudinal grooves 110.
  • the grooves 110 have a depth h with average pitch ⁇ and radii of curvature at the top pe. Said ribbing is known in modern fluid-dynamics with the name "riblet”, and keeps the inductor primary flow layer adherent as far as the outfeed of the diffuser duct 108, increasing the gain of the propulsive thrust Nw.
  • the propulsion system body 101 thrust, as well as rotating through the azimuth angle ⁇ , can oscillate with a round angle in the plane perpendicular to it.
  • the propulsion system body 101 may advantageously be allowed to oscillate according to two straight lines between perpendicular lines lying in a plane perpendicular to the axis X whose line in the plane of the drawing is represented by the longitudinal axis CL.
  • Figure 3 shows a second embodiment of the nautical propulsion system disclosed, in which the delivery flow Fl with flow rate Qm enters the propulsion system at a right angle to the longitudinal axis CL and comes out in the annular area Ig with a fixed angle of inclination ⁇ , positioned so that it adheres along the wall 19 which, in the stretch 19', similarly to what was described above relative to Figure 2, is worked with riblets, that is to say, has longitudinal grooves 110.
  • the primary delivery or inductor flow Fl remaining adherent to the wall 19, applies a pulling action for the rest of the fluid current in the throat 20 area.
  • the vacuum zone -P induced by the primary flow, draws the induced secondary flow Fe with flow rate Qe.
  • the diffuser skirt 109 at its end zone 21, has a plurality of small holes 111 with predetermined diameter and pitch.
  • the zone 22 of the inner skirt 109 at the back is sucked by the duct 112 connected to the pump 3, with a flow rate Qa regulated by a modulating valve, of the known type and not illustrated, with proportional opening.
  • the embodiment in Figure 3 can rotate through the angle ⁇ about the axis X of the straight duct 107 (0° - 360° in the azimuth plane), and can oscillate with a round angle in the plane perpendicular to it.
  • the propulsion system apparatus with primary flow at a right angle to the induced secondary flow disclosed was tested in a cavitation channel, on test tank models and actual-size prototypes. It operates with a delivery water flow rate which is a fraction of between 1/3 and 1/15 of the flow rate coming out of the diffuser nozzle.
  • the boundary layer adheres along the diffuser duct of the propulsion system body 101.
  • the embodiment in Figure 2 with decreasing propelling jet inflow angles, depending on the speed (variable geometry), is suitable for high navigation speeds (up to 60 - 70 knots) for low and medium installed power in the optimum range of between 20 and 600 kW.
  • the embodiment in Figure 3 is advantageous for medium navigation speeds from 12 to 25 knots, with high installed power, from 300 to 3000 kW.
  • the propelling jet inflow angle is constant, since the nozzle is fixed.
  • the boundary layer is sucked by a surface with holes made in it, the suction created by the pump and its flow rate modulated by a special regulating valve, not illustrated.
  • the propulsion system operating principle is the same: the two flows, respectively the primary flow and the secondary flow, cross one another vectorially with a very high amplification ratio, and with very limited delivery pump intake water flow rate compared with the flow coming out of the propulsion system (on average 10 times less).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)

Abstract

L'invention concerne un appareil de propulsion nautique pour navigation en surface et/ou sous l'eau comprenant un corps de système de propulsion (101), une unité (1) permettant de fournir une alimentation, ou flux primaire, au corps du système de propulsion (101) ; l'unité d'alimentation (1) comprenant un moteur à combustion interne (2) et une pompe (3) entraînée par le moteur à combustion interne (2).
PCT/IB2007/002216 2006-08-11 2007-08-02 Système de propulsion nautique pour navigation en surface et/ou sous l'eau WO2008017916A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITRM20060442 ITRM20060442A1 (it) 2006-08-11 2006-08-11 Propulsore nautico per navigazione di superficie e subacquea
ITRM2006A000442 2006-08-11

Publications (2)

Publication Number Publication Date
WO2008017916A2 true WO2008017916A2 (fr) 2008-02-14
WO2008017916A3 WO2008017916A3 (fr) 2008-04-17

Family

ID=38920610

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/002216 WO2008017916A2 (fr) 2006-08-11 2007-08-02 Système de propulsion nautique pour navigation en surface et/ou sous l'eau

Country Status (2)

Country Link
IT (1) ITRM20060442A1 (fr)
WO (1) WO2008017916A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024044142A1 (fr) * 2022-08-21 2024-02-29 Jetoptera, Inc. Système de propulsion et ses applications

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB944640A (en) * 1962-02-20 1963-12-18 Algonquin Shipping & Trading Bow manoeuvering jet system for vessels
CH447856A (de) * 1967-01-13 1967-11-30 Mercatura Ag Reaktionsantrieb für Wasserfahrzeuge
FR2044105A5 (fr) * 1969-05-12 1971-02-19 Roumejon Leon
DE3433810A1 (de) * 1984-09-14 1986-03-27 Peter 2000 Hamburg Labentz Strahlantrieb
DE20007137U1 (de) * 2000-04-18 2001-08-23 Schiller, Helmut, 64625 Bensheim Strahl-Antriebsvorrichtung für Wasserfahrzeuge
DE10357309A1 (de) * 2003-12-05 2005-07-07 Schönwälder, Joachim, Dipl.-Ing. Schubrohr

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024044142A1 (fr) * 2022-08-21 2024-02-29 Jetoptera, Inc. Système de propulsion et ses applications

Also Published As

Publication number Publication date
WO2008017916A3 (fr) 2008-04-17
ITRM20060442A1 (it) 2008-02-12

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