JP5896444B2 - Simultaneous measurement of pressure distribution and velocity distribution - Google Patents

Simultaneous measurement of pressure distribution and velocity distribution Download PDF

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JP5896444B2
JP5896444B2 JP2010261437A JP2010261437A JP5896444B2 JP 5896444 B2 JP5896444 B2 JP 5896444B2 JP 2010261437 A JP2010261437 A JP 2010261437A JP 2010261437 A JP2010261437 A JP 2010261437A JP 5896444 B2 JP5896444 B2 JP 5896444B2
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博隆 坂上
博隆 坂上
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Description

本発明は、定常・非定常流の空間情報、すなわち、流れの速度分布に加えた圧力または温度分布を計測する方法に関する。   The present invention relates to a method for measuring spatial information of a steady / unsteady flow, that is, a pressure or temperature distribution applied to a flow velocity distribution.

粒子画像流速測定法は流体中に粒子を注入し、それを追跡することで一様流中の流れ場を計測する。この方法は速度分布計測に限定されており、流体計測で必要とされる圧力・温度については計測が不可能である。それに対し物体表面の圧力・温度分布を計測する方法として、感圧・感温塗料を風洞模型等に塗布して表面の圧力・温度分布計測することが行われている。これらの塗料は蛍光・りん光を圧力・温度に関連づける化学センサである。塗布面の発光量を圧力・温度分布に関連付けるが、それらを抽出するためには圧力・温度分布以外に依存する発光分布（リファレンス）を計測する必要がある。強度法と呼ばれる計測法はそのリファレンス画像と圧力・温度分布を含んだ画像比から圧力・温度のみの情報を抽出するのであるが、流体計測中では圧力・温度分布が生じるため、リファレンス計測は不可能である。そのため粒子の位置が計測時間ごとに変化する粒子画像流速測定では、感圧・感温塗料で必要とされるリファレンスが計測できない。それに対しリファレンスを計測中に取得する方法として寿命法が存在する。これは感圧・感温塗料の発光寿命をリファレンスと圧力・温度に関係づける方法である。しかし、この方法は発光現象の短い時間（ナノ〜マイクロ秒オーダー）で計測する必要があり、また発光現象を計測するため、計測機器に十分な発光信号を与えることができない。そのため、この方法は定常流または周期的な非定常流に限定して行われている。この方法を適用して感温塗料を粒子に塗布・コーティングし、温度分布と速度分布を同時計測する試みがなされている。   The particle image velocimetry method measures a flow field in a uniform flow by injecting particles into a fluid and tracking them. This method is limited to velocity distribution measurement, and pressure and temperature required for fluid measurement cannot be measured. On the other hand, as a method for measuring the pressure / temperature distribution on the surface of an object, a pressure / temperature sensitive paint is applied to a wind tunnel model or the like to measure the pressure / temperature distribution on the surface. These paints are chemical sensors that relate fluorescence and phosphorescence to pressure and temperature. The light emission amount on the coated surface is related to the pressure / temperature distribution, but in order to extract them, it is necessary to measure the light emission distribution (reference) depending on other than the pressure / temperature distribution. The measurement method called the intensity method extracts only pressure / temperature information from the reference image and the image ratio including the pressure / temperature distribution. However, the reference measurement is not possible because the pressure / temperature distribution occurs in the fluid measurement. Is possible. For this reason, in the particle image flow velocity measurement in which the position of the particles changes every measurement time, it is not possible to measure the reference required for the pressure-sensitive / temperature-sensitive paint. On the other hand, there is a lifetime method as a method for acquiring a reference during measurement. This is a method of relating the light-emission life of pressure-sensitive and temperature-sensitive paints to the reference and pressure / temperature. However, in this method, it is necessary to measure in a short time (nano to microsecond order) of the light emission phenomenon, and since the light emission phenomenon is measured, a sufficient light emission signal cannot be given to the measuring device. Therefore, this method is limited to steady flow or periodic unsteady flow. Attempts have been made to simultaneously measure temperature distribution and velocity distribution by applying and coating a temperature-sensitive paint onto particles by applying this method.

上記の計測法である特許文献１に開示された発明の目的は、流れを乱すことなく流れ場の温度、圧力、速度の分布を計測することができる同時計測方法および装置を提供することであって、当該発明の「流れ場の温度、圧力、速度分布の同時計測方法」は、感温塗料と感圧塗料を微細な固体粒子のトレーサとして流れ場に混入して流すトレーサ供給ステップ（Ａ）と、感温塗料と感圧塗料にそれぞれ特定の励起波長の光を照射して励起状態にする励起ステップ（Ｂ）と、流れ場にシート状の光を照射しシート面に垂直方向からトレーサの画像を撮影して速度分布を計測する速度計測ステップ（Ｃ）と、感温塗料の特定の放出波長Ｗ１の光強度Ｉ１を計測して温度分布を計測する温度計測ステップ（Ｄ）と、感圧塗料の特定の放出波長Ｗ２の光強度Ｉ２を計測して圧力分布を計測する圧力計測ステップ（Ｅ）と、からなることを特徴とする。   The object of the invention disclosed in Patent Document 1 which is the above measurement method is to provide a simultaneous measurement method and apparatus capable of measuring the distribution of temperature, pressure, and velocity of the flow field without disturbing the flow. The “simultaneous measurement method of temperature, pressure, and velocity distribution of the flow field” of the present invention is the tracer supply step (A) in which the temperature-sensitive paint and the pressure-sensitive paint are mixed into the flow field as fine solid particle tracers. Excitation step (B) for irradiating the temperature-sensitive paint and the pressure-sensitive paint with light of a specific excitation wavelength to bring them into an excited state, and irradiating the flow field with sheet-like light and perpendicularly to the sheet surface A speed measurement step (C) for measuring the speed distribution by taking an image, a temperature measurement step (D) for measuring the light intensity I1 of the specific emission wavelength W1 of the temperature-sensitive paint and measuring the temperature distribution, and pressure sensitivity Light with specific emission wavelength W2 of paint And to measure the degree I2 pressure measurement step of measuring a pressure distribution (E), characterized in that it consists.

また、本出願人が先に出願した特許文献２の発明の課題は、周期的な非定常圧力変動場であって、その変動成分が広帯域にわたる成分を持っている場の変動圧力の分布を画像計測する手法を提示すること、また圧力変動が小さい微小圧力場であっても変動圧力成分の分布が計測できるような手法を提示することにある。そして、当該発明の「感圧塗料による非定常圧力場の画像計測方法」は、感圧塗料あるいは感圧コーティングを用いた画像計測であって、取得された感圧塗料あるいは感圧コーティングからの発光データを基にして、該発光データにおける周波数次元での圧力変動成分の分布を画像化して表示するようにした。具体的には、画像取得装置によって得られた感圧塗料あるいは感圧コーティングからの発光データである複数枚の時系列画像を、画像上の２次元の軸と時間軸から成る一連の３次元データとして扱い、周波数解析または時間周波数解析によって非定常変動圧力に関わる状態量を得るようにしたものである。   Further, the problem of the invention of Patent Document 2 previously filed by the present applicant is a periodic unsteady pressure fluctuation field, and the fluctuation pressure distribution in a field in which the fluctuation component has a component over a wide band is imaged. It is to present a method for measuring, and to present a method for measuring the distribution of the fluctuating pressure component even in a micro pressure field with a small pressure fluctuation. Further, the “image measurement method of an unsteady pressure field using a pressure-sensitive paint” according to the present invention is an image measurement using a pressure-sensitive paint or a pressure-sensitive coating, and light emission from the acquired pressure-sensitive paint or pressure-sensitive coating. Based on the data, the distribution of the pressure fluctuation component in the frequency dimension in the emission data is imaged and displayed. Specifically, a plurality of time-series images, which are light emission data from a pressure-sensitive paint or pressure-sensitive coating obtained by an image acquisition device, are converted into a series of three-dimensional data consisting of a two-dimensional axis and a time axis on the image. The state quantity related to the unsteady fluctuating pressure is obtained by frequency analysis or time frequency analysis.

しかし、従来の流れ場の温度、圧力、速度の分布を計測方法における流れは定常流に限定される。圧力計測においては、感圧塗料の特性から温度依存性を含んでいるため、温度計測に比べより計測が困難となるため、圧力分布と速度分布の同時計測は行われていない。特に非定常流れについて、粒子に感圧・感温塗料を塗布・コーティングすることによる圧力・温度分布と速度分布の同時計測は達成されていない。   However, the flow in the conventional method for measuring the temperature, pressure, and velocity distribution of the flow field is limited to a steady flow. In pressure measurement, since temperature dependence is included due to the characteristics of the pressure-sensitive paint, measurement is more difficult than in temperature measurement, so pressure distribution and velocity distribution are not simultaneously measured. Especially for unsteady flows, simultaneous measurement of pressure / temperature distribution and velocity distribution by applying and coating pressure-sensitive and temperature-sensitive paints on particles has not been achieved.

特開２００４−１６３１８０号公報 「流れ場の温度、圧力、速度分布の同時計測方法および装置」 平成１６年６月１０日公開JP 2004-163180 A “Method and Apparatus for Simultaneous Measurement of Flow Field Temperature, Pressure, and Velocity Distribution” Published on June 10, 2004 特開２００８−８２７３５号公報 「感圧塗料による非定常圧力場の画像計測方法」 平成２０年４月１０日公開JP 2008-82735 A “Image Measurement Method of Unsteady Pressure Field Using Pressure-Sensitive Paint” Released on April 10, 2008

本発明の課題は、定常・非定常流の速度分布に加え、圧力または温度分布を同時に供する計測法を提示し、速度分布と圧力または温度分布の相関関係を得ることも可能とすることにある。   It is an object of the present invention to present a measurement method that simultaneously provides pressure or temperature distribution in addition to steady and unsteady flow velocity distribution, and to obtain a correlation between velocity distribution and pressure or temperature distribution. .

本発明の圧力分布を速度分布と同時に計測する方法は、シグナルに影響されないリファレンスとなる発光と圧力に反応するシグナルとなる２色発光を備えた発光物質であって、リファレンスとシグナルの温度依存性が同一のものを、バインダーを用いることなく表面に塗布した多孔質粒子を流体に混合し、該流体の流れの場に励起光を照射し、リファレンスとシグナルの発光を波長分離して同時に画像計測し、その比により圧力計測時における感圧色素の温度依存性を解消して圧力分布を速度分布と同時に計測するものとした。
また、本発明の圧力分布を速度分布と同時に計測する方法は、励起波長として460ｎｍ付近の青色より低波長域用い、リファレンス、シグナル発光を生み出す色素として550ｎｍ付近の緑色発光を持つ色素と650ｎｍ以上の波長（赤色）での発光を持つ色素を用いるものとした。
また、本発明の圧力分布を速度分布と同時に計測する方法は、上記構成において、リファレンスとシグナルの発光を波長分離して同時に画像計測する赤緑青の３画像で構成される高速カラーカメラを用いて非定常現象を同時取得し、速度分布と圧力分布の相関関係を取ることを特徴とするものとした。 The method for measuring the pressure distribution at the same time as the velocity distribution of the present invention is a luminescent substance having a luminescence that is a reference that is not influenced by a signal and a two-color luminescence that is a signal that reacts to pressure, and the temperature dependence of the reference and the signal. Porous particles coated on the surface without using a binder are mixed with a fluid, and the fluid flow field is irradiated with excitation light. Thus, the temperature dependence of the pressure sensitive dye at the time of pressure measurement was eliminated, and the pressure distribution was measured simultaneously with the velocity distribution.
In addition, the method of measuring the pressure distribution of the present invention simultaneously with the velocity distribution uses a lower wavelength region than the blue wavelength near 460 nm as an excitation wavelength, and a reference and a pigment having a green emission near 550 nm as a pigment that generates signal emission. A dye having light emission at a wavelength (red) was used.
The method for measuring the pressure distribution at the same time as the velocity distribution of the present invention uses the high-speed color camera composed of three images of red, green, and blue in which the reference and signal emission are wavelength-separated and simultaneously image-measured. It is characterized by acquiring unsteady phenomena at the same time and taking a correlation between velocity distribution and pressure distribution.

本発明の圧力分布を速度分布と同時に計測する方法は、圧力分布および速度分布の同時計測が可能となった。また、非定常な流れに対し上記の同時計測が可能となった。そして、同時計測により圧力分布と速度分布の相関関係が取得可能となった。混合する粒子に多孔質粒子を採用したことにより、２種類の色素はバインダーを用いることなく多孔質粒子に混在して吸着でき、バインダーを用いないことにより高速応答性が保たれる。更に、２色発光比を用いることにより圧力計測時に含まれる温度誤差を解消することができた。 The method for measuring the pressure distribution simultaneously with the velocity distribution of the present invention enables simultaneous measurement of the pressure distribution and the velocity distribution. In addition, the above simultaneous measurement is possible for unsteady flows. And the correlation between pressure distribution and velocity distribution can be acquired by simultaneous measurement. By adopting porous particles as the particles to be mixed, two types of dyes can be adsorbed in the porous particles without using a binder, and high-speed response can be maintained by not using a binder. Furthermore, the temperature error included in the pressure measurement could be eliminated by using the two-color emission ratio.

２色発光のスペクトル特性と励起波長域を示すグラフである。It is a graph which shows the spectrum characteristic and excitation wavelength range of two-color light emission. (a)は２色発光のスペクトルを示すグラフであり、(b)は高速デジタルカラーカメラの波長感度特性を示すグラフである。(a) is a graph showing the spectrum of two-color emission, and (b) is a graph showing the wavelength sensitivity characteristics of the high-speed digital color camera.

以下、本発明の実施の形態について、詳細に説明する。
感圧・感温塗料からの発光画像は圧力・温度情報以外に励起光が分布を持つことから生じる発光分布、カメラとの位置関係による発光分布を含む。それらをキャンセルし、圧力・温度情報のみ抽出するにはリファレンス画像の取得が必要である。粒子画像流速測定法においてリファレンス画像を取得するには、感圧・感温塗料が適用された粒子が時間的に位置変化することから、前記の背景技術で述べた強度法によるリファレンス画像取得はできない。寿命法では発光量を積算可能な定常流、周期的な非定常現象では適用可能となるが、非定常流では発光量レベル（ＳＮ比）が低く、計測が困難となる。そこで本発明者は、一方の発光が圧力・温度に依存しないリファレンス、他方が圧力・温度により発光量が変化するシグナルを持つ２色発光を有する感圧・感温塗料を利用することで上記リファレンス画像取得の問題が解決できないか考えた。 Hereinafter, embodiments of the present invention will be described in detail.
The light emission image from the pressure-sensitive / temperature-sensitive paint includes, in addition to pressure / temperature information, a light emission distribution resulting from the distribution of excitation light and a light emission distribution due to the positional relationship with the camera. In order to cancel them and extract only pressure / temperature information, it is necessary to acquire a reference image. In order to acquire a reference image in the particle image velocimetry, it is impossible to acquire a reference image by the intensity method described in the background art, because the position of the particles to which pressure-sensitive and temperature-sensitive paint is applied changes over time. . The life method can be applied to a steady flow in which the amount of light emission can be integrated and a periodic unsteady phenomenon, but the non-steady flow has a low light emission level (SN ratio) and is difficult to measure. Therefore, the present inventor uses the above-mentioned reference by using a pressure-sensitive / temperature-sensitive paint having two-color light emission in which one light emission does not depend on pressure / temperature and the other has a signal whose light emission amount changes depending on the pressure / temperature. I thought about the problem of image acquisition.

発光を生み出す蛍光またはりん光色素は異なる波長で発光することで２色発光するが、それらは波長分離可能な範囲で発光する必要がある。これらの色素は励起ムラによる発光分布が同一である必要があるため、同じ波長領域で励起可能である必要がある。かつ、励起波長は２色発光の波長領域から分離される必要がある。これらの条件を満たす発光物質を多孔質粒子に適用することで高速応答性を備え、非定常試験への適用も可能となる。本発明者はこれらの知見を基に鋭意実験を重ね、図１に示されるように、励起波長として460ｎｍ付近の青色より低波長域用い、リファレンス、シグナル発光を生み出す色素として550ｎｍ付近の緑色発光を持つ色素と650ｎｍ以上の波長（赤色）での発光を持つ色素を用いることに至った。２種類の色素はバインダーを用いることなく多孔質粒子に混在して吸着される。バインダーを用いないことにより高速応答性が保たれる。   Fluorescent or phosphorescent dyes that produce luminescence emit two colors by emitting at different wavelengths, but they need to emit in a wavelength separable range. Since these dyes need to have the same emission distribution due to uneven excitation, they must be excitable in the same wavelength region. And the excitation wavelength needs to be separated from the wavelength region of two-color emission. By applying a luminescent material satisfying these conditions to the porous particles, it has high-speed response and can also be applied to unsteady tests. Based on these findings, the present inventor has conducted extensive experiments, and as shown in FIG. 1, the excitation wavelength is lower than the blue wavelength near 460 nm, and the reference and signal emission are emitted as a green color near 550 nm. It came to use the pigment | dye which has light emission with the wavelength which has it, and the wavelength (red) of 650 nm or more. The two types of dyes are adsorbed in the porous particles without using a binder. High-speed response can be maintained by not using a binder.

同時分光計測システムは２色の発光分布を同時に計測する機構が必要となる。この手段として高速デジタルカラーカメラを用いた。高速デジタルカラーカメラは赤（Ｒ）緑（Ｇ）青（Ｂ）の３画像で構成される。各画像は干渉フィルターの役割を果たし、上記シグナル画像、リファレンス画像を分光計測する。上記方法で粒子を追跡することで、従来の画像粒子流速法を適用することが可能となる。これにより圧力または温度分布を速度分布と同時に計測することが可能となる。   A simultaneous spectroscopic measurement system requires a mechanism for simultaneously measuring the emission distributions of two colors. A high-speed digital color camera was used as this means. The high-speed digital color camera is composed of three images of red (R), green (G), and blue (B). Each image serves as an interference filter, and the signal image and the reference image are spectrally measured. By tracking the particles by the above method, the conventional image particle flow velocity method can be applied. As a result, the pressure or temperature distribution can be measured simultaneously with the velocity distribution.

［２色発光比を用いたリファレンス画像取得］
高速デジタルカラーカメラで計測される画像は以下に示す式(1)と式(2)で表わされる。

Figure 0005896444
ここで、Vijはカメラの受像素子における任意のピクセルijでの信号レベルを示す。それがシグナル画像（Ｒ、Ｇ、Ｂ画像のいずれか）での信号レベルであればVSij、リファレンス画像（残り２画像のうちのいずれか）であればVRijと表示する。ijピクセルでの励起光分布による発光分布をCillu、カメラとの位置関係による分布をClocと表示する。Cillu、とClocは粒子の時間変動によってその値を変化させるため、時間ｔの関数となっている。シグナル、リファレンスに関与しないこれらの発光分布は関数ｇで表現される。圧力・温度に依存する発光をシグナルIS、そのいずれにも依存しない発光をリファレンスIRとする。２色発光比は式(1)と式(2)の比を取ることにより得られる。この比は同一時間での比であり、それによりCillu、とClocはシグナルとリファレンスで同一の値を示す。これにより、シグナル、リファレンスに関与しない発光分布ｇはキャンセルされる。
Figure 0005896444
 シグナルが圧力感度を持つ場合、以下の式で圧力と発光量が関係づけられる。
Figure 0005896444
 ここでrefは基準となる圧力、温度での値を示す。AS、BSは係数であり、Ｐは圧力を示す。シグナルとリファレンスの発光比IR/ISは式(3)で示され、式変形(4)をすることで変形式Iref_sigは式(4)と同様に圧力に関係づけられる。
Figure 0005896444
 式(7)において、圧力感度σは傾き、すなわち係数BSに相当する。この値が大きければ圧力感度が高いことを示す。
Figure 0005896444
 シグナル、リファレンスは温度依存性を有しており、それらは以下の式(9)、(10)で示される。ここでcS0、cS1、cR0、cR1は係数である。Ｔは温度を示す。
Figure 0005896444
 温度感度δは式(9)、式(10)の係数に相当する。
Figure 0005896444
 [Reference image acquisition using two-color emission ratio]
Images measured by the high-speed digital color camera are expressed by the following equations (1) and (2).
Figure 0005896444
 Here, V ij represents a signal level at an arbitrary pixel ij in the image receiving element of the camera. If it is a signal level in a signal image (any of R, G, B images), V Sij is displayed, and if it is a reference image (any one of the remaining two images), V Rij is displayed. The emission distribution by the excitation light distribution at the ij pixel is displayed as C illu , and the distribution by the positional relationship with the camera is displayed as C loc . C illu and C loc are functions of time t because their values change with time variation of the particles. These light emission distributions not related to the signal and the reference are expressed by a function g. Emitting a signal I S that is dependent on pressure and temperature, the luminescence does not depend on any of them with the reference I R. The two-color emission ratio can be obtained by taking the ratio of the formula (1) and the formula (2). This ratio is the same time ratio, so that Cillu and C loc show the same value in the signal and reference. As a result, the emission distribution g not related to the signal and reference is canceled.
Figure 0005896444
 When the signal has pressure sensitivity, the pressure and the amount of luminescence are related by the following equation.
Figure 0005896444
 Here, ref indicates a value at a reference pressure and temperature. A S and B S are coefficients, and P indicates pressure. The light emission ratio I R / I S of the signal and the reference is expressed by the equation (3), and by changing the equation (4), the modified equation I ref_sig is related to the pressure as in the equation (4).
Figure 0005896444
 In the equation (7), the pressure sensitivity σ corresponds to the slope, that is, the coefficient B S. Larger values indicate higher pressure sensitivity.
Figure 0005896444
 The signal and reference have temperature dependence, and they are represented by the following formulas (9) and (10). Here, c S0 , c S1 , c R0 , and c R1 are coefficients. T indicates temperature.
Figure 0005896444
 The temperature sensitivity δ corresponds to the coefficients of the equations (9) and (10).
Figure 0005896444

［圧力計測における温度誤差の解消］
式(9)および式(10)の係数が以下の関係を示すと仮定する。これはすなわち、シグナルとリファレンスの温度依存性が一致する場合において満たされる条件である。
ＣS0＝ＣR0 (13)
ＣS1＝ＣR1 (14)
このとき式(11)および式(12)の温度感度は一致する。温度式についても式(7)と同様にIref_sigを求めると式(15)となる。

Figure 0005896444
式(15)は式(13)および式(14)を満たすため、温度Ｔに依存する項は解消され、圧力計測における温度誤差は解消される。 [Resolution of temperature error in pressure measurement]
Assume that the coefficients of equations (9) and (10) have the following relationship: This is a condition that is satisfied when the temperature dependence of the signal and the reference match.
C S0 = C R0 (13)
C S1 = C R1 (14)
At this time, the temperature sensitivities of the equations (11) and (12) coincide. As for the temperature formula, when I ref_sig is obtained in the same manner as formula (7), formula (15) is obtained.
Figure 0005896444
 Since Expression (15) satisfies Expression (13) and Expression (14), the term depending on the temperature T is eliminated, and the temperature error in the pressure measurement is eliminated.

２色発光を有する感圧・感温塗料の色素を例示すると、リファレンスとして例えば poly [1- (trimetylsilyl) phenyl- 2- phenylacetylene]（PTMST）やアントラセンが用いられ、
感圧色素としては例えば、PtTFPL：pt(II)meso-tetra (pentafluorophenyl) porpholactone、PdTMPｙP：正式な学術名はPalladium(II)meso-tetrakis(4-N-methylpyridyl)porphyrin］、PtTPP：Platinum Tetraphenyl Porphyrinの他PtTFPP、PdFPP、PtOEP、PdOEP、PdTPP、PdTFPP、ポルフォラクトン等がシグナル検出用に、
感温色素として例えば、PdTMPｙP： 正式な学術名はPalladium(II)meso-tetrakis(4-N-methylpyridyl)porphyrin］、Eu四核錯体、例として[Eu4(μ-0)(L1)10](L1=2-hydroxy-4-octyloxybenzophenone)や([Eu4(μ-0)(L2)10](L2=2-hydroxy-4-dodecyloxybenzophenone)の構造式を有するEu四核錯体化合物、ローダミンＢ誘導体RhoB-MA、ローダミンＢ（2-(3-Diethylimino-6-diethylamino-3H-xanthen-9-yl)benzoic Acid Chloride）等が温度シグナル検出用に用いられる。
２色発光スペクトルを図２(a)に示す。高速応答性を有する多孔質粒子に適用することで本発明の最良の塗料が構成される。本発明を実施する装置に適した高速デジタルカラーカメラとしてPhantom Miro 4 （商品名）を用いた。このカメラの波長感度を図２(b)に示す。緑画像は発光スペクトルのリファレンスに対応しており、赤画像はシグナルに対応していることが確認できる。現段階では本発明の方法を用いて表面分布計測が可能である。リファレンスとなる発光と圧力または温度に反応するシグナルとなる２色発光を備えた発光物質を表面に塗布した多孔質粒子を流体中に散布し、該流体の流れの場に励起光を照射しつつ、当該カメラで撮影すれば、リファレンスとシグナルの発光を波長分離して同時に画像を得ることができる。このようにして粒子画像計測法による、圧力または温度分布と速度分布の同時計測が可能となる。 Examples of dyes for pressure- and temperature-sensitive paints that emit two colors of light include poly [1- (trimetylsilyl) phenyl-2-phenylacetylene] (PTMST) and anthracene as references,
Examples of pressure-sensitive dyes include PtTFPL: pt (II) meso-tetra (pentafluorophenyl) porpholactone, PdTMPyP: formal scientific name is Palladium (II) meso-tetrakis (4-N-methylpyridyl) porphyrin], PtTPP: Platinum Tetraphenyl Porphyrin Other PtTFPP, PdFPP, PtOEP, PdOEP, PdTPP, PdTFPP, porpholactone, etc. for signal detection
For example, PdTMPyP as a thermosensitive dye: The official scientific name is Palladium (II) meso-tetrakis (4-N-methylpyridyl) porphyrin], Eu tetranuclear complex, for example, [Eu 4 (μ-0) (L 1 ) 10 Eu tetranuclear complexes with structural formulas such as [(L 1 = 2-hydroxy-4-octyloxybenzophenone) and ([Eu 4 (μ-0) (L 2 ) 10 ] (L 2 = 2-hydroxy-4-dodecyloxybenzophenone)) Compounds, rhodamine B derivatives RhoB-MA, rhodamine B (2- (3-Diethylimino-6-diethylamino-3H-xanthen-9-yl) benzoic Acid Chloride) and the like are used for temperature signal detection.
A two-color emission spectrum is shown in FIG. The best coating material of the present invention is constituted by applying to porous particles having high-speed response. Phantom Miro 4 (trade name) was used as a high-speed digital color camera suitable for the apparatus for carrying out the present invention. The wavelength sensitivity of this camera is shown in FIG. It can be confirmed that the green image corresponds to the reference of the emission spectrum, and the red image corresponds to the signal. At the present stage, the surface distribution can be measured using the method of the present invention. Sprinkling porous particles coated with a luminescent material with two-color luminescence that becomes a signal that reacts to the reference luminescence and pressure or temperature in the fluid, while irradiating the fluid flow field with excitation light If an image is taken by the camera, an image can be obtained simultaneously by wavelength separation of reference and signal emission. In this way, simultaneous measurement of pressure or temperature distribution and velocity distribution by the particle image measurement method becomes possible.

本発明の時間変動を伴う圧力・温度分布と速度分布の同時計測法は、流れ場の速度分布情報に加え圧力分布または温度分布を同時に必要とする流体計測分野として航空宇宙、自動車、船舶、都市工学、土木工学、海洋工学分野に適用可能である。   The simultaneous measurement method of pressure / temperature distribution and velocity distribution with time fluctuation according to the present invention is a fluid measurement field that requires pressure distribution or temperature distribution at the same time in addition to flow field velocity distribution information. Applicable to engineering, civil engineering and marine engineering fields.

Claims (3)

シグナルに影響されないリファレンスとなる発光と圧力に反応するシグナルとなる２色発光を備えた発光物質であって、リファレンスとシグナルの温度依存性が同一のものを、バインダーを用いることなく表面に塗布した多孔質粒子を流体に混合し、該流体の流れの場に励起光を照射し、リファレンスとシグナルの発光を波長分離して同時に画像計測し、その比により圧力計測時における感圧色素の温度依存性を解消して圧力分布を速度分布と同時に計測する方法。   A luminescent substance with a luminescence that is a reference that is not affected by the signal and a two-color luminescence that is a signal that reacts to pressure, and the temperature dependence of the reference and the signal is the same as that applied to the surface without using a binder Porous particles are mixed with a fluid, the excitation flow is irradiated to the flow field of the fluid, the reference and signal emission are wavelength-separated, and the image is measured simultaneously. This is a method to measure the pressure distribution at the same time as the velocity distribution by eliminating the characteristics. 励起波長として460ｎｍ付近の青色より低波長域用い、リファレンス、シグナル発光を生み出す色素として550ｎｍ付近の緑色発光を持つ色素と650ｎｍ以上の波長（赤色）での発光を持つ色素を用いるものである請求項１に記載の圧力分布を速度分布と同時に計測する方法。   A dye having a green emission near 550 nm and a dye having an emission at a wavelength of 650 nm or more (red) is used as a reference or signal emission dye using a lower wavelength region than blue near 460 nm as an excitation wavelength. A method for measuring the pressure distribution according to 1 simultaneously with the velocity distribution. リファレンスとシグナルの発光を波長分離して同時に画像計測する赤緑青の３画像で構成される高速カラーカメラを用いて非定常現象を同時取得し、速度分布と圧力分布の相関関係を取ることを特徴とする請求項２に記載の圧力分布を速度分布と同時に計測する方法。 It is characterized by the simultaneous acquisition of unsteady phenomena using a high-speed color camera consisting of three images of red, green and blue that simultaneously measure the image of the reference and signal emission by wavelength separation, and take the correlation between velocity distribution and pressure distribution A method for measuring the pressure distribution according to claim 2 simultaneously with the velocity distribution.
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