SR-72 Confirmed: Mach 6 Project Blackswift

The SABRE engine, recently discussed here, has passed its PDR.


www.parabolicarc.com...

A novel approach for design and analysis of volume-improved osculating-cone waveriders

Authors:

Chen et al

Abstract:[/]

A novel design methodology for waverider is proposed based on the conical flow field, named volume-improved osculating-cone waveriders. The new waverider is generated through three given curves, including flow capture curve, inlet capture curve, and curve of the center of exit shock. To meet more design requirements, the curve of the center of exit shock, which can be flexibly designed, is newly introduced to generate configurations with different properties and performances. The feasibility and effectiveness of the method have been verified by computational fluid dynamics (CFD) simulation. The discrepancies between the volume-improved osculating-cone waverider and conventional waveriders are numerically analyzed in detail. The results demonstrate that the new waverider takes the advantage of the volumetric efficiency with little loss of performance compared to the conventional waveriders in design conditions. Furthermore, the results of the off-design conditions show excellent aerodynamic performance as the conventional waverider. Moreover, for bluntness with a radius of 10 mm, the new waverider synthetically owns higher viscous lift-to-drag ratio and greater volumetric efficiency than conventional configurations at 0° angle of attack. Therefore, the novel approach is useful to design the hypersonic waverider vehicle.

www.sciencedirect.com...

edit on 17-3-2019 by anzha because: forgot link

a reply to: anzha

Hi Anzha,

I appreciated the effort you go in to posting all these whitepapers, but is this really the right place? I keep coming back here when I see a new post about the SR-72 and all I find is some reference to an engineering article without any link to SR-72 other than a possible link to hypersonics. Can this not go under some generic 'hypersonic theory' thread?

It's really cluttering up what was once a great thread.

Cheers
Robbie

I have been informed.thia is the thread for all manner hypersonic aircraft discussions. It's a bit misnamed, but the guidance was from someone who had been here a very, very long time.

Second, these are not white papers, but peer reviewed scientific papers. There is a substantial difference in effort and actual experimentation. The reason to post them is to point out the authors and their locales.

There is some insane ideas that America is the one and only source for tech: the DOD just stated China is the world leader in hypersonic tech. These papers are mostly the white world of China's research. This is what they are willing to tell us. The rest should be pretty obvious.

a reply to: stratsys-sws

It's a lot easier to bundle everything related into one area. Hence the 6th Gen, and other threads. That way you don't have to hunt down 15 threads to find what you're looking for. Since the Blackswift is hypersonic, it makes sense to bundle the hypersonic information with it.

Investigation of ignition characteristics in a kerosene fueled supersonic combustor

Authors:

Tian et al

Abstract:

Ignition characteristics of a kerosene fueled supersonic combustor has been numerically and experimentally investigated in the present paper. Flame luminosity images and wall pressure measurements are used for better understanding the ignition and combustion characteristics, air throttling is used to enhance ignition in the combustor. The results are obtained under the inflow condition of Ma number 2.0, total pressure 1.0 MPa and total temperature 1100 K which corresponds to Ma4.5 flight condition. When the ER (Equivalence Ratio) of kerosene is 0.19, the kerosene cannot be ignited at all only by the spark plug. When the flux ratio of air throttling (the ratio of mass flux of air throttling to mass flux of the inflow air) is 9.1%, a small part of kerosene can be ignited, but the flame is blown off soon. When the throttling air flux ratio is increased to 13.7% or 24.5%, the kerosene can be ignited successfully, and the combustion is stable and intense. Cold room temperature liquid kerosene can be ignited successfully by the spark plug with the aid of the throttling air.

www.sciencedirect.com...

Aeroheating reduction for blunt body using aerodome jet

Authors:

Qin et al

[b]Abstract:

A novel thermal protection concept that combines the aerodome and cooling nitrogen is introduced for aeroheating reduction in high-speed flights. Study involves the fluid–thermal interaction between the blunt body and surrounding fluid. After detailed grid and time step verification and numerical validation with available experimental results, the influence of jet pressure and jet distance on the aeroheating reduction performance are analyzed comprehensively. Results indicate that the advantages of the novel combination of aerodome and cooling nitrogen over the conventional opposing jet are mainly embodied in the following three aspects. Firstly, the stability of both the aerodome-jet and the flow field structure can be ensured in wide ranges of flight speed and jet pressure, due to the existence of aerodome. Secondly, on the premise of providing overall thermal protection for the blunt body, emphasis is placed on the direct and continuous cooling of the front part of blunt body where severe aeroheating occurs. Thirdly, the thermal protection performance can be improved without sacrificing the drag reduction performance by selecting a suitable set of jet pressure and jet distance.

www.sciencedirect.com...

Convolutional neural network based combustion mode classification for condition monitoring in the supersonic combustor

Authors:

Zhou et al

Abstract:

Supersonic combustor is one of the core components in the scramjet, so it is of great significance to monitor the combustion modes in the combustor to ensure the safe and stable operation of the scramjet engine. Traditionally, several key parameters or manually-engineered features are selected as the indicators to evaluate the operation conditions, which usually heavily depends on the professional experience and carries considerable limitations. Convolutional neural networks have been proved to be effective in automatic feature extraction and have shown better generalization performance. Hence, it is attractive and promising to apply Convolutional neural networks to condition monitoring in mechanical systems due to their excellent ability of pattern recognition. To accomplish the classification of combustion modes, a convolutional neural network based method is proposed, which can learn features directly from the raw pressure data collected during supersonic combustion experiments. Meanwhile, the proposed method is compared with the traditional machine learning methods, such as multilayer perceptron, k-nearest neighbor, single-hidden layer feedforward neural network, and support vector machine. Furthermore, feature data is constructed by manual statistical features from time domain and frequency domain. The raw data and feature data are both considered to study the influence of feature extraction methods on the performance of different models. The results show that the proposed convolutional neural network based method is able to reveal intrinsic features from raw data and effectively complete the classification of four main combustion modes occurring in the combustor. The novel approach achieves a higher classification accuracy and better generalization performance than other comparative methods.

www.sciencedirect.com...

This one REALLY ought to catch the group's interest:

Experimental investigation of the effects of chamber length and boron content on boron-based gel fuel ramjet performance

Authors:

Xiao et al

Abstract:

The high specific impulse of the ramjet engine, coupled with the potential of a gel to carry boron particles, makes the boron-based gel fuel ramjet a most appropriate solution for a mid-high range sustainer. The current research work aims at verifying the empirical feasibility of this kind of a concept, besides studying the combustor performance. A test facility and a lab-scale motor have been designed and developed for the investigation of the impact of the chamber length and boron particle content on the combustion efficiency of the motor. As the results suggest, the combustion efficiency declines with the increasing boron particle content. Moreover, a higher combustion efficiency was attained with the longer chamber. As the mass fraction of boron particles reaches 40%, the combustion efficiency, which is based on the temperature rise, still has the potential to reach 80%.

www.sciencedirect.com...

Speculating on what this bad boy is powered by is a waste of ones time and brain cells. Its been flying for 14 years that I know of but kept flying slow at night near the U.S. as to not wake up the sheep. One night they needed to rattle Cuba though and this is how I know its the real deal.

The dam thing about shattered my windows and the space shuttle wasn't anything in comparison. This is the military's version of advanced secret craft we will show you one day, the UFO type craft we will never see them admit to.

They plan on pulling off the fake Alien invasion before too long. When the threat of Russia and Chinese Communism completely disappears they will use it to justify two things.

One thing is to try and force everyone into thinking Jesus was just a mortal man and two is to keep the military budget flowing to Lockheed and the rest.

a reply to: RudeMarine

That's very interesting post, RudeMarine.

As for the bird you described. You are saying it's been flying for 14 years. Is it still in use today or was it replaced by something else? And as far as you can tell, when it became flying(and/or when it became flying in R/D development?)?

Cheers!

One thing I never understood is why there seems to be more public information, articles, and unintended or intended slip ups on the upcoming SR-72 than the green lady which is clearly already somewhat operational. Like why would they even talk about the sr-72 at all especially if it is more advanced/faster(an assumption)? I also don’t understand the need for both of these aircraft unless they are used by different agencies or? Can someone enlighten me?

a reply to: USAFTW

You don't put all your eggs in one basket. That's why we have the U-2, RQ-4, and all those other ISR systems. Some systems work better at doing some things than others.

China is the world leader in hypersonic tech.

From what Ive heard Russia isnt far behind.

Now that is pretty cool, a gel based fuel to carry the boron particles. Could they refuel something like that mid-air through a boom?

originally posted by: RudeMarine
They plan on pulling off the fake Alien invasion before too long. When the threat of Russia and Chinese Communism completely disappears they will use it to justify two things.

One thing is to try and force everyone into thinking Jesus was just a mortal man and two is to keep the military budget flowing to Lockheed and the rest.

Thats not the first time I`ve heard about a staged "Alien" invasion and I`d like to know more via PM if you or anyone else is willing.

a reply to: RudeMarine

You have a PM, Sir. Check this out by clicking a letter icon in the upper right corner of the page, please.

a reply to: megamac

Check out your PMs aswell, please. Click on the letter icon in the upper right corner of the page.

Sandia helped develop an "AI" for flying hypersonic aircraft.

newatlas.com...

www.janes.com...

Chinese scientists have developed a new heat-resistant material for hypersonic aircraft which can endure over 3,000 C from friction caused by a Mach 5-20 flight within the atmosphere.

The lead scientist on the project said the material outperforms all similar foreign-made ones with its high melting point, low density and high malleability.

The new material enables a hypersonic aircraft to fly at Mach 5-20 within the atmosphere for several hours, as the high heat resulting from the friction between the aircraft and the air reaches between 2,000 C to 3,000 C, a temperature normal metal would not be able to endure.

Normal metals melt at around 1,500 C, but this new material can bear over 3,000 C for an extended period, state-owned Hunan Television reported recently.

Unlike foreign technologies that use traditional refractory metals and carbon-carbon materials, the China-made new material is a composite of ceramics and refractory metals, Fan Jinglian, the lead scientist who developed the material and a professor at Central South University in Central China’s Hunan Province, told the Global Times.

www.defencetalk.com...