Hypersonic flight

Vehicles and engines that fly at more than five times the speed of sound.

China leads hypersonic flight research, with 65.9% of the 10% most cited papers published 2021–2025; the United States is second with 7.4%.

FirstChina65.9%

SecondUnited States7.4%

8.9×lead, by share of the 10% most cited papers, 2021–2025

Highlight a country

Standings

1CNChina65.9%2USUnited States7.4%3INIndia6.0%4–7ITItaly1.7%4–7KRSouth Korea1.7%4–7HKHong Kong1.6%4–7DEGermany1.5%8IRIran1.3%9–11FRFrance0.9%9–11SASaudi Arabia0.9%

Share of the 10% most cited papers, 2021–2025; 372 papers. Source: OpenAlex, pulled 18 October 2026. Method

Year by year

About 74 papers a year. Single-year moves are noise.

China

Everyone else, on a larger scale

Share of the 10% most cited papers published in each year. Source: OpenAlex, pulled 18 October 2026. Method

Inside the field

Always the top 10%Pilot

Each paper sorted into one sub-area by an AI model reading its title and abstract, then credited as usual. On 200 hand-labelled papers it chose the same sub-area, or a defensible second, 92% of the time.

Sub-area	Papers	First	Second	Third
Scramjet and detonation engine combustion	116	CNChina60.3%	INIndia13.6%	USUnited States4.2%
Aerothermodynamics, boundary layers and high-speed flow	75	CNChina49.1%	USUnited States17.4%	HKHong Kong6.9%
Guidance, control and trajectories (incl. interception)	56	CNChina92.5%	NLNetherlands1.1%	GBUnited Kingdom0.7%
Active cooling and fuel heat transfer	46	CNChina83.7%	KRSouth Korea5.8%	IRIran1.4%
Ultra-high-temperature ceramics and thermal protection materials	35	CNChina73.1%	USUnited States9.5%	GBUnited Kingdom3.1%

Share of each sub-area's papers in the top 10%. Source: OpenAlex, pulled 18 October 2026. Method

Earlier and recent

The same top 10%, split into 2021–2023 and 2024–2025.

FallingRising2021–20232024–2025Change

CNChina 62.4%69.7%+7.3 pts

USUnited States 6.5%8.3%+1.8 pts

INIndia 8.7%3.1%−5.6 pts

ITItaly 2.8%0.5%−2.3 pts

KRSouth Korea 1.1%2.3%+1.2 pts

HKHong Kong 2.4%0.7%−1.7 pts

DEGermany 2.1%0.8%−1.3 pts

IRIran 1.4%1.1%−0.3 pts

Greyed rows rest on fewer than five papers of credit in one period.

Share of the 10% most cited papers: 197 papers in 2021–2023, 175 in 2024–2025. Source: OpenAlex, pulled 18 October 2026. Method

2026 so far: a different count

Not the most cited papers: every 2026 paper matched so far (896), and a paper counts in full for each country on it. This year's papers are too new to rank by citations, so these shares cannot be compared with the ones above.

CNChina63.1%of 2026 papers have an author here
USUnited States13.6%of 2026 papers have an author here
INIndia6.0%of 2026 papers have an author here
HKHong Kong3.0%of 2026 papers have an author here
DEGermany2.6%of 2026 papers have an author here

Who cites the top papers

How much more often a country's top papers are cited from home than its size predicts. Expected is the country's share of all papers in the field; the bar is the excess, in percentage points. Home citers include authors citing their own earlier work.

HomeExpectedExcess

CNChina 83.1%61.8%+21.3

USUnited States 31.3%12.9%+18.4

Based on up to 100 of each country's most cited single-country papers in the top 10%. Source: OpenAlex, pulled 18 October 2026. Method

Behind the share

Institutions with the most credit

1CNNational University of Defense Technology12.6%
2CNNorthwestern Polytechnical University9.5%
3CNHarbin Institute of Technology7.2%
4CNChina Aerodynamics Research and Development CenterResearch facility3.1%
5CNBeihang University3.0%
6CNTsinghua University1.9%
7CNXi'an Jiaotong University1.7%
8CNWuhan University of Technology1.6%
9CNCentral South University1.4%
10CNChinese Academy of SciencesGovernment lab1.3%

Share of the top 10%. Institutions across all 45 technologies

Who does the work

Sector	All	CN	US	IN
Universities	85.5%	88.4%	71.6%	94.3%
Research facilities	10.5%	8.1%	19.7%	5.3%
Government labs	2.9%	3.2%	2.3%	0.4%
Other	0.5%	0.1%	3.7%	0%

Share of credit by type of institution, overall and for the three leading countries.

Across borders

19.1% of the top 10% have authors in more than one country.

CNINChina with India7
INIQIndia with Iraq6
CNHKChina with Hong Kong6
CNGBChina with United Kingdom6
IQIRIraq with Iran6

Most frequent pairings, by number of shared papers.

The papers behind the numbers

The five most cited papers this definition catches. If one looks out of place, the definition needs work.

Advances in ultra-high temperature ceramics, composites, and coatings
Journal of Advanced Ceramics, 2021CN
789citations
Materials design for hypersonics
Nature Communications, 2024US
475citations
Review of control and guidance technology on hypersonic vehicle
Chinese Journal of Aeronautics, 2021CN
313citations
A review of regenerative cooling technologies for scramjets
Applied Thermal Engineering, 2021CN
262citations
Ultra-high temperature ceramics: Aspiration to overcome challenges in thermal protection systems
Ceramics International, 2021INUS
180citations

How this technology is defined

A paper counts if its title or abstract matches the search below. Articles in core journals and proceedings only; retracted papers are excluded.

hypersonic OR scramjet OR "boost-glide"

and its main topic in OpenAlex is one of: Computational Fluid Dynamics and Aerodynamics; Gas Dynamics and Kinetic Theory; Fluid Dynamics and Turbulent Flows; Heat transfer and supercritical fluids; Adaptive Control of Nonlinear Systems; Advanced ceramic materials synthesis; Combustion and flame dynamics; Guidance and Control Systems; Plasma and Flow Control in Aerodynamics; Aeroelasticity and Vibration Control; Combustion and Detonation Processes; Rocket and propulsion systems research; Advanced Aircraft Design and Technologies. The topic check removes papers that only mention the technology.

Papers matched, 2021–2025: 3,691
In the top 10%: 372
In the top 1%: 38
Countries with credit: 28
Credit with no known country: 5.3%

Every one of the 482 most cited papers was checked for relevance; 41 were left out as not about hypersonic flight

The most cited of those left out:

Rayleigh–Taylor and Richtmyer–Meshkov instabilities: A journey through scales347 citations
Oxidation of ultrahigh temperature ceramics: kinetics, mechanisms, and applications131 citations
An overview of ultra-high temperature ceramic for thermal insulation: Structure and composition design with thermal conductivity regulation98 citations
Oxidation behavior of non-stoichiometric (Zr,Hf,Ti)Cx carbide solid solution powders in air93 citations
Ablation behavior and mechanisms of Cf/(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C–SiC high-entropy ceramic matrix composites89 citations
Exceptional Oxidation Resistance of High‐Entropy Carbides up to 3600 °C73 citations
Improved thermal stability and infrared emissivity of high-entropy REMgAl11O19 and LaMAl11O19 (RE=La, Nd, Gd, Sm, Pr, Dy; M=Mg, Fe, Co, Ni, Zn)72 citations
Subcell limiting strategies for discontinuous Galerkin spectral element methods54 citations
A three-dimensional modal discontinuous Galerkin method for the second-order Boltzmann-Curtiss-based constitutive model of rarefied and microscale gas flows52 citations
Prescribed-Time Control for Nonlinear Systems With Sensor Faults and Unknown Control Directions47 citations
A symmetrized and simplified Bernoulli trial collision scheme in direct simulation Monte Carlo47 citations
High entropy ultra-high temperature ceramic thermal insulator (Zr1/5Hf1/5Nb1/5Ta1/5Ti1/5)C with controlled microstructure and outstanding properties47 citations

Definition version 0.5, pilot. It is a plain text file: copy it, change it, rerun it.

Read the method