Solid propellant is a kind of solid energetic material which is specially processed, contains oxidant and combustion agent, and can regularly burn to produce a large amount of hot gas. It is widely used in aerospace and military fields

Previously, a university planned to carry out research on solid energetic materials, and reached a cooperation with Point Stone Instrument on customized laboratory equipment. In response to the special needs of our customers, Point Stone Instruments tailor-made a laboratory equipment for observing and analyzing the changes and characteristics of the pyrolytic combustion reaction of solid energetic materials - heat Island.

Heat island adopts functional modular design concept, mainly composed of shell system, cavity system, data acquisition and electrical system, gas supply system and other modules. Overall compact and highly integrated

（1）Shell system: mainly undertake structural functions, including cavity, electrical, data acquisition, air intake system.

（2） The cavity system: it is the area of the material combustion reaction

（3） Data acquisition and electrical system: mainly collect the pressure in the chamber and the temperature field of material combustion; All data acquisition and control, air intake control, pressure data acquisition, temperature data acquisition are unified control and display through the instrument panel.(3) Data acquisition and electrical system: mainly collect the pressure in the chamber and the temperature field of material combustion; All data acquisition and control, air intake control, pressure data acquisition, temperature data acquisition are unified control and display through the instrument panel.

【main function】

The main functions of heat island include: heating and ignition, environment construction, multi-view observation, data collection, product analysis, multiple protection and so on.

1.heating ignition

Ignition position: Above the material, the sealing electrode is installed on the material flange, and the ignition wire can be heated above the material through external control, so that the material is burned from the top down.Ignition position: Above the material, the sealing electrode is installed on the material flange, and the ignition wire can be heated above the material through external control, so that the material is burned from the top down.

2. Environment construction

Nitrogen or argon gas is connected and output from the gas source using stainless steel gas supply pipe, and reaches the interior of the chamber after summary. Two pipes are controlled independently, and only one pipe can be used.

3. Multi-perspective observation

Positive window: For viewing window, infrared detection, filming and observation of the experimental process (with high-speed camera and infrared camera) can be performed.

Positive window: For viewing window, infrared detection, filming and observation of the experimental process (with high-speed camera and infrared camera) can be performed.

4. Data collection

Pressure acquisition: The pressure sensor can collect pressure data in real time during the experiment.
Temperature acquisition: Thermocouples can measure the temperature of material combustion, and display and record the corresponding relationship between real-time temperature and time through the instrument.
Synchronous excitation: Simultaneous excitation of the high-speed camera and the infrared camera during ignition, so that they can simultaneously perform image/temperature recording.

5. Product analysis

The gas detection port can be connected to an external gas pre-treatment module. Through the pre-treatment module, the generated gas is dehumidified, dedusted, and deoiled, which leads to the specified gas detection and analysis device.

6.multiple protection

Safety doors, automatic pressure relief devices, combustion chamber temperature monitoring, combustion chamber insulation, etc. provide all-round protection for experimental personnel.

【Technical parameters】

● Cavity volume: 1.5L
● Maximum working pressure: 8MPa
● Combustion chamber: cylindrical, horizontal
● Ignition mode: resistance wire ignition
● Ignition temperature: ≥1500℃
● Material platform: resistant to 2700℃ high temperature
Sapphire window: diameter 70mm, compressive strength 10MPa

【attractive point in design】

Study of materials

304 steel: The main material of the cavity is 304 steel. The material has good corrosion resistance, heat resistance, low temperature strength, mechanical properties; Stamping bending and other hot processing good, no heat treatment hardening phenomenon.

Sapphire glass: The sight glass is made of sapphire glass material. Sapphire material has the characteristics of good temperature resistance, good thermal conductivity, high hardness, infrared penetration and good chemical stability.
Zirconia: The material platform is made of zirconia and can withstand high temperature of 2700℃.

High security

Ensure the safety, sealing and protection of the equipment while taking into account the operating pressure of the equipment.

High precision

Special conversion modules and programs are used to realize synchronous firing and ensure the accuracy of delay time.

Design humanizationThe equipment structure design is convenient, and the parts replacement, installation, maintenance and cleaning are more convenient and simple.

High degree of automation

High degree of automation, repeatability, consistency.

Powerful

The equipment has powerful functions, which can carry out direct shooting, infrared detection, temperature monitoring, pressure monitoring, connecting gas analysis instruments, etc., to meet the various needs of customers.

Easy to operate

The equipment is easy to operate, and the independent development program can control all functions. All operations are carried out on the same panel, pressure, temperature and other data can be stored in real time, and corresponding curves can be output.

The heat island independently developed by Beijing Deshi High-tech is suitable for the study of the ignition and start-up process, thermal decomposition and combustion performance of solid energetic materials, and provides a safe and reliable experimental platform for the cooperative objects to study the combustion wave curve, flame structure and product composition during the combustion process of solid energetic materials, which is of great significance for improving rocket propulsion technology.