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  Thema: What turbulence causes - Learn it and Simulation Method 1
Mustafa Umut Sarac

Antworten: 2
Aufrufe: 49

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 22:00   Titel: What turbulence causes - Learn it and Simulation Method 1
As you can see at the first paper , AFTER FIRST REVOLUTION , rotor loses % 80 to % 100 lift. This is due to turbulence.

This is the first paper which can simulate the flow.
  Thema: What turbulence causes - Learn it and Simulation Method 1
Mustafa Umut Sarac

Antworten: 2
Aufrufe: 49

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 21:52   Titel: What turbulence causes - Learn it and Simulation Method 1
https://1.bp.blogspot.com/-fRWbABbixlE/XfKnodPxwGI/AAAAAAAAHNM/tgbHb2IjH5YITvTBs1_VPEceuU36fhBUwCNcBGAsYHQ/s1600/Pages%2Bfrom%2BModeling%2BMultirotor%2BAerodynamic%2BInteractions%2BThrough%2Bthe%2BVor ...
  Thema: What turbulence causes - Learn it and Simulation Method 1
Mustafa Umut Sarac

Antworten: 2
Aufrufe: 49

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 21:51   Titel: What turbulence causes - Learn it and Simulation Method 1
PAPER IS HEREBELOW


Brigham Young University
BYU ScholarsArchive
All Faculty Publications
2019-6
Modeling Multirotor Aerodynamic Interactions
Through the Vortex Particle Method
Eduardo Alvar ...
  Thema: Symmetric marine multibladers antisymmetric performance
Mustafa Umut Sarac

Antworten: 1
Aufrufe: 55

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 20:40   Titel: Symmetric marine multibladers antisymmetric performance
J. Fluid Mech., page 1 of 49 Cambridge University Press 2011
doi:10.1017/jfm.2011.150
1
Mechanisms of evolution of the propeller wake in the transition and far fields

M. FELLI†1, R. CAMUSSI2 AN ...
  Thema: Tip Hub Vortex, Wake, Near Far Field Evolution FINAL WORDS
Mustafa Umut Sarac

Antworten: 0
Aufrufe: 63

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 20:27   Titel: Tip Hub Vortex, Wake, Near Far Field Evolution FINAL WORDS
J. Fluid Mech., page 1 of 49 c Cambridge University Press 2011
doi:10.1017/jfm.2011.150
1
Mechanisms of evolution of the propeller
wake in the transition and far fields
M. FELLI†1, R. CAMUSSI2 A ...
  Thema: Symmetric marine multibladers antisymmetric performance
Mustafa Umut Sarac

Antworten: 1
Aufrufe: 55

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 17:18   Titel: Symmetric marine multibladers antisymmetric performance
I will post paper , image and details in coming hours.

I am looking in to marine propeller simulations and their performance is antisymmetric when the blades layout are symmetric.

I quickly thou ...
  Thema: Multiblader drops out few blades during flight when it slows
Mustafa Umut Sarac

Antworten: 0
Aufrufe: 35

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 12.12.2019, 17:01   Titel: Multiblader drops out few blades during flight when it slows
I thought if the multiple bladers lift equals to multilade X single blade lift , it is same for the air resistance.

We can throw an multiblader and after some time , it drops out few wings to lower ...
  Thema: Hollow Boomerang and Air Resonance to Lower Flow Separation
Mustafa Umut Sarac

Antworten: 0
Aufrufe: 113

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 08.12.2019, 21:52   Titel: Hollow Boomerang and Air Resonance to Lower Flow Separation
We can 3d print or produce hollow bodied boomerang to keep an air column inside. Outer skin would be too much thin and internal air resonance frequency and thin soundboard skin resonances can be calcu ...
  Thema: On Propeller Blade Wakes and Two Spirals Distance
Mustafa Umut Sarac

Antworten: 0
Aufrufe: 79

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 08.12.2019, 21:11   Titel: On Propeller Blade Wakes and Two Spirals Distance
I researched propeller wakes subject and I learned two things :

First , Blade wakes happens in to area , blade tip and blade hub.

Second, it depends to more the two spirals distance to get the l ...
  Thema: Auto Variable Pitch Boomerang with Analog Computing Gear Hub
Mustafa Umut Sarac

Antworten: 0
Aufrufe: 90

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 08.12.2019, 20:28   Titel: Auto Variable Pitch Boomerang with Analog Computing Gear Hub
This idea is insprired by marine variable pitch propellers which each blade rotates on their hub to match with flow field.

I think we can add intelligence in to hub without electricity.

3D print ...
  Thema: Graphene , can be 3 times lighter than Carbon
Mustafa Umut Sarac

Antworten: 1
Aufrufe: 869

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 04.12.2019, 05:46   Titel: Graphene , can be 3 times lighter than Carbon
Breakthrough in graphene-reinforced composites
Editor's choice: New research reports nanoreinforced resin shows significant strength improvements

December 23, 2014
Manufacturing Group
Composites ...
  Thema: Graphene , can be 3 times lighter than Carbon
Mustafa Umut Sarac

Antworten: 1
Aufrufe: 869

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 04.12.2019, 05:24   Titel: Graphene , can be 3 times lighter than Carbon
Tonight , I have just invested time in motorcycle chassis made from fiber reinforced polymer.

I found too many sites on bicycle chassis and one british company - where chief scientist is a former r ...
  Thema: Unstallable, Multiple Slot, Coanda Effect Boomerang Airfoil
Mustafa Umut Sarac

Antworten: 14
Aufrufe: 1932

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 02.12.2019, 09:26   Titel: Unstallable, Multiple Slot, Coanda Effect Boomerang Airfoil
Hello Andreas,

I researched gas turbines 25 years. I have been encountered with many many different technologies , I read hundreds of NASA papers , DTIC papers. I have broad lines of hobbies. These ...
  Thema: Unstallable, Multiple Slot, Coanda Effect Boomerang Airfoil
Mustafa Umut Sarac

Antworten: 14
Aufrufe: 1932

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 19.11.2019, 06:22   Titel: Unstallable, Multiple Slot, Coanda Effect Boomerang Airfoil
Manuel,

You are expert on XFOIL. Can XFOIL design such a triple slotted or exotic airfoils ?

Can XFOIL optimize a raw design ?

By the way , do competition rules , rules out the shape changing ...
  Thema: Unstallable, Multiple Slot, Coanda Effect Boomerang Airfoil
Mustafa Umut Sarac

Antworten: 14
Aufrufe: 1932

BeitragForum: Tipps zum Bauen und Werfen   Verfasst am: 18.11.2019, 23:18   Titel: Unstallable, Multiple Slot, Coanda Effect Boomerang Airfoil
Manuel,

Paper tells about only triple slotted design have the attached flow.

Mechanisms , sensors can make everything very interesting. This first prototype could have two options , opened or cl ...
 
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