2025 TECH BRIEFS Create the Future Design Contest.
" Quasiturbine Rotary Engine welcomes most fuel and hydrogen " and has been qualified as
No. 13390
Inspired by the possibility of surpassing the current supremacy of Piston and Wankel engines by creating without any eccentric crankshaft, a new type of unconventional 4-stroke continuous combustion low RPM and high torque turbine-like, clean and efficient and HCCI or photo-detonation compatible. In this Quasiturbine the active pressure acts only tangentially on the periphery contour shape modifiable independently of the rotor (without radial displacement and without the flow prejudice cause in Piston and Wankel by acceleration inversion during stroke).
For each engine type, the 4-stroke 2-rotations Ratio of " Intake volume to external engine volume " (the engine power density) is:
Single Piston 10%;
Single Wankel 42%;
QT-SC 67%; and
QT-SCLimit 160% (intakes more than its external volume!).
More at Section 23 :
Quasiturbine and Wankel concepts
The Quasiturbine Rotaty (Qurbine) is a « Positive Displacement » turbine alternative.
suitable as a double-circuits Rotary Motor or Expander
for compressed air, steam and other fluids,
or (later) as an advanced Internal Combustion Rotary Engine,
as well as (later) for Compressor of various thermodynamic cycles.
The Quasiturbine Rotaty is a compact, low weight and high torque machine
with top efficiency, specially in power modulation applications, like in
aviation or for Drones propulsion.
The Quasiturbine Rotary is a pistonless Rotary Machine
using a deformable rotor whose blades (sides) are hinged at the vertices.
The volume enclosed between the blades of the rotor
and the stator casing provides compression and expansion
in a fashion similar to the familiar Wankel engine,
but the hinging at the edges allows higher compression ratio
and different time dependencies, while suppressing the Wankel rotor dead time
and single rotor vibration,
and this without the complex rotor synchronization gears.
Pressure-flow energy conversion :
+/- 80 % of the perfect « single-stage theoretical expander ».
(Optimum all across the power range - No off-peak penalty)
QUASITURBINE INTERNAL COMBUSTION
(produit not offered) Test bench made by a group of
volunteers at www.apuq.com
from an internal combustion engine block loaned par Quasiturbine.
Projet initiated and directed by
M. Claude Gratton, ex-pompier de Montréal.
www.youtube.com/watch?v=heqN_ssJeOQ
Typical comparison:
Engine displacement versus the Total engine volume
4 strokes engine type
Unit displacement
Engine volume
Piston
1
15 to 25
Wankel
1
10 to
15
Quasiturbine
1
1.5 to 5
The Quasiturbine is a positive displacement turbine
with a total displacement near the engine volume
(Imagine one day, a 3 litres car engine into a
3 litres volume!)
Unlike vane pumps, which vane extension is important and against which
the pressure acts to generate the rotation, the Quasiturbine contour seals have an
imperceptible extension and the rotation does not result from pressure against these seals.
Since the cylindrical (or oval) stator of vane devices has a radius of curvature
greater than the rotor, the two surfaces (rotor - stator) cannot reach a close
fit at top dead center (TDC), while the surfaces of both the rotor and stator of
the Quasiturbine fit exactly against one another to produce a high compression
ratio. This is why QT is efficient (less pressure charging losses), and this is why there is no vane combustion engine.
Quasiturbine publishes « efficiency data ».
