Sunday, October 7, 2007

Perfectly Utilized Rotor

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Area-contact Seal Rotary Engine

Problems to be solved:

1. To eliminate the common weaknesses of conventional engines whether reciprocating, rotary, internal combustion, external combustion, gas-turbine, diesel, or Otto types.
2. To gain superiority of advantages when compared to the advantages of conventional engines.
3. To gain other exceptional advantages which are absent in any of the conventional engines.

Enumeration of eliminated common weaknesses of typical engines:
1. Of reciprocating engines:
a. More moving parts
b. Acceleration and deceleration of large masses
c. Complicated valve mechanisms

d. Slowest speed of all types
e. Heaviest and bulkiest of all types
f. Lowest volumetric efficiency
g. Need of batteries and/or cranking motors at large capacity types
2. Of Wankel rotary engines:
a. Very leaky working chambers
b. Highest maintenance of seals
c. Lowest compression ratio
d. Lowest fuel economy and thermodynamic efficiency
e. Greatest surface area and heat loss of combustion chambers
f. Very irregular epitrochoid-housing shape
g. Necessity of synchronizing gear and bearings on the rotor
h. Worst distortion caused by uneven thermal distribution
i. Most polluting of all types
j. Very limited to costly, volatile, and flammable fuels
3. Of internal combustion engines:
a. Costly device for fuel introduction:
· precision common-rail injectors
· throttled intake by bulky carburetors
b. Lack of waste heat recovery apparatus
c. Vibration by intermittent instantaneous combustion pressures
4. Of external combustion engines:
a. Non-portability
b. Bulky heat exchangers and combustion chambers
c. Mostly with stationary and localized structure for huge capacity types
5. Of gas turbine engines:
a. Very expensive rotor blades and most complex and expensive frame
b. Most inefficient thermodynamic cycle
c. Least fuel economy at low-speed operation
d. High maintenance cost of blade replacement
e. Necessity of bulky reduction gears for high torque conversion
f. Very inefficient low operating-combustion temperature
g. Less agility of transport vehicle use due to gyroscopic effect
6. Of diesel engines:
a. Disadvantages of reciprocating parts
b. Very bulky and heavy construction due to more parts subjected to high pressures
c. Expensive fuel injector that is sensitive to abrasive particles

d. More surfaces subjected to carbon deposit
e. Most polluting when not properly maintained
7. Of Otto/gasoline engines:
a. Disadvantages of reciprocating parts
b. Most inefficient compression ratio attained
c. Very less volumetric efficiency due to displacement caused by vaporized fuel
d. Ignition most likely to foul at numerous conditions
e. Very inefficient throttling especially at higher speed
f. Needs dangerously flammable fuels to be stored safely
g. Very expensive maintenance due to more intricate electronics

h. Very susceptible to failure at freezing conditions

Superiority of Advantages in comparison to conventional engines:
1. Reciprocating engines:
a. Far greater turbocharging effect with much shorter air manifold placed in the rotor side due to induced centrifugal action of the rotor to the intake air and the expanding exhaust gas
b. More tighter seal due to tighter clearances due to even thermal distribution
c. Better lubricated seal due to cycling of oil around the housing chambers with no ports
d. Lower attainable RPM due to tighter seal
e. More even seal wear due to wider surface contact and lesser contact pressure
f. Very less vibration imparted by moving parts due to greater hydrodynamic lubrication
g. More complete expansion due to dedicated tight expansion chamber
h. More leveled torque output than multi-cylinder types due to more cycles per shaft turn
i. No special fabrication toolings required
2. Wankel rotary engines:
a. More effective rotor for the added chambers due to elimination of gears and bearings
b. Lesser overall centrifugal force due to inherent opposing centrifugal forces
c. Higher attainable RPM due to area-contact seal effecting hydrodynamic action of oil
d. More dynamic transfer ports located in the rotor aided by imparted centrifugal action
e. Lesser cost to manufacture due to added regularity of the chamber shapes
f. Lesser vibration due to lesser rotor mass by the elimination of gears and bearings
g. More compact package due to added higher efficiency attained
h. Much cheaper to be made into ceramics due to much smaller package
i. More independent on cranking motors at higher capacity types in favor of compressed gas
3. Internal combustion engines:
a. Much greater portability due to elimination of bulky conventional fuel system
b. Much compact that it can effectively use dedicated compression and expansion chambers
4. External combustion engines
a. More rigid and compact heat exchanger due to intimacy of air manifolds at the rotors
b. Far more effective and still cheap fuel delivery due to simple inherent air injector
c. Very effective steam power generation by using only the air injector mentioned above
d. Simplest exhaust condenser by the use of rotor cavities subjected to centrifugal force
e. Simplest water separator in the form of rotor cavities
5. Gas turbine engines:
a. Lesser secondary gas ingestion due to added advantage of lower excess air intake aside from inherent opposing intake and exhaust ports without unnecessary long manifolds
b. Far more lighter construction due to accumulated advantages and superior efficiency
c. Has better output shaft performance in equivalent RPM due to higher shaft torque
d. Greater speeds without the danger of cavitation and for lesser mass subjected to centrifugal force
e. Far more advantageous for aviation due to more adaptability for ducted fan propulsion
f. Much lower vibration due to superior compact package in comparable horsepower
g. Much quieter operation due to far lesser air intake and gas exhaust
h. Far greater multi-fuel range due to higher compression ratio
6. Diesel engines:
a. Much cheaper bunker fuel due to greater tolerance of air injector to abrasive particles
b. Much higher compression ratio attained for higher efficiency due to inherent simple heat exchanger using rotor cavities
c. Far higher and flatter shaft torque due to multiple hybrid cycle per shaft rotation
d. Far more rigid due to added compactness aside from having thicker walls
e. Far greater multi-fuel range due to dedicated combustion and expansion chambers
7. Otto/gasoline engines:
a. More efficient and sustainable higher peak ignition pressure due to pre-chamber closed to compression chamber and open to expansion chamber by use of simple needle valves
b. Much effective and cheaper fuel delivery by use of simple inherent air injector
c. Far more lighter even in diesel-type of operation with thicker walls due to compactness
d. Cleaner in operation due to continuous wiping and filtering of oil in expansion chambers

Other exceptional advantages of this simple rotor configuration:
1. By far simpler and cheaper to mass produce
2. Very sturdy in construction and safer in operation by the use of pre-chambers
3. Very light and small of equivalent horsepower (Less than 1/10th the size of reciprocating engines if of equivalent volume of normally-aspirated intake air, equivalent speed, and same thermodynamic cycle)
4. Excellent regenerative braking by effective air compression storage with its very compact compressor and superbly high pressure attained in storage tanks

see my design-contest entry sponsored by NASA Tech Briefs:

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Julius said...

I have invented a rotary engine that would minimize drastically our dependence in petroleum. This engine would use plant-based oils as fuel as it operate in a thermodynamically-efficient diesel cycle. But the big environmental impact of it is the minimal use of raw materials and processes that would have negative environmental effects: it uses very little metals as it will be made out of ceramics that makes it very long lasting and would not contribute to wasteful metallic scraps and the energy-wasting manufacturing processes to make another replacements, unlike the ordinary bulky inefficient engines which have very less life cycle. Moreover, it is energy and fuel efficient inherent with the area-contact sealing it has attained with very few moving parts, such that friction, heat, and mechanical losses are very negligible. It has eliminated also the inefficient processes like the cooling system and fluid restrictions like throttling and small ports that would waste precious energy. This improvements would very much enhance the safety and reliability of the engine and its compact package would snow-ball into smaller, lighter and more responsive components whether of transportation use or for stationary applications like generator sets and prime mover. Hopefully the world would embrace the ecological and economic benefits my invention would entail as I offer my invention for free without any patent and no patent infringements to fear upon, as the success of the design I presented would need the cooperation of research institutions interested to develop the design further in a much faster pace so that we could replace sooner those wasteful conventional engines.

Anonymous said...

Ok, send me details of your engine ideas.
By the way,I would have willingly signed an NDA so your idea would have been protected.
However, even if it works, you have lost all patent protections afforded to you, if you had only kept your ideas to yourself.
If your idea has merit then you were insane to make it public on the Web.
I can therefore only advise you on the feasibility of your ideas but cannot commercialize them even though we have the expertise and finance to do so.

Regards, Paul F Ellis

Senior Partner, Ritrans Ltd